It took me until my mid-30s to feel like I had crossed a threshold in processing grief and trauma from my late teen years. I was capable of adult behavior long before then, but my concept of the world and how I fit into it (or don't) was still childlike in many ways on a fundamental level.
Like most such things, I'd expect this to be a spectrum, and I may be somewhat of a late bloomer. Regardless, I have a theory that there is somewhat of a protective effect operating here. Believing in a simpler reality which involved future wish fulfillment for me - however unrealistic it was - may have helped me survive. Coming to acceptance of what I see as a more accurate but far bleaker perspective required me to grow strong enough to sustain my will to live despite that perspective.
Biggest lesson learned: I could not do it without at least one other person (or more) who I trust almost 100% with all of myself. Realizing that going it alone is futile is definitely part of what I consider becoming an adult, and it can take a long time to fully accept that.
> Biggest lesson learned: I could not do it without at least one other person (or more) who I trust almost 100% with all of myself.
Its strange. The biggest lesson I learned was almost the opposite: I learned that the meaning of life has nothing to do with other people or their estimation of me. It has more to do with who you are when there is nobody else around. Other people often act as a sort of fun house mirror that distort and reflect back a false image.
Learning to be happy alone and seeing through the pleasant lies is absolutely vital to becoming an adult.
> Realizing that going it alone is futile is definitely part of what I consider becoming an adult
Weird, for me its the complete opposite. I accepted to live alone for the rest of my life because a) I am undesired and I wont make a move. b) I barely met people I would even consider it being worth talking to, I need to feel equal on a cognitive level and not a lot of people match that requirement. I either feel lesser or above.
I did not feel fully adult until my parents passed on. I was in my early 40s at that point. Then I knew that there was no fallback; it was all up to me.
A person becomes an adult once they take responsibility for their own actions and the consequences thereof. Many people never reach that status, regardless of age.
Sounds like you cannot bear making yourself the sole person responsible and need to involve more people in your decision making cope. Not sure if that’s healthy tbh, just sounds like you don’t like shouldering blame for responsibilities.
So if you were childlike before in your thinking I guess at least you’re a college student now.
It's kind of interesting to compare this to Ptolemy's eras. In the Tetrabiblios, Ptolemy argued that man went through seven ages in his life, each associated with a different celestial object.
1. Infancy --- The Moon. Since the Moon waxes and wanes more rapidly than any other celestial object, this period is characterized by the fastest development.
2. Childhood --- Mercury. As Mercury is the fastest of the planets, at this age children have the short attention spans and flit from one thing to the next.
3. Youth --- Venus. Starting around puberty, a man's mind starts to become focused on love.
4. Young Adulthood --- The Sun. A man comes of age, he starts to think about his work and people begin to take him seriously.
5. Middle Adulthood --- Mars. In his mid 30s a man's demeanor becomes more severe. He realizes he has certain goals he would like to accomplish and there is not much time left to achieve them.
6. Maturity --- Jupiter. By his mid 50s, having achieved what he can in his life, he has arrived at a position of authority in the community. He has gravitas and respect.
7. Old Age --- Saturn. By his late 60s, he starts to decline physically and mentally.
It is worth noting that this exact sequence (the Chaldean sequence) of the seven classical celestial objects follows the same paths as the Serpent of Wisdom coiled about the Tree of Life in the Hermetic Qabalah. This is the western analogue to the Hindu notion of Kundalini, which shares the same serpentine symbolism; both of which represent the process of the psychological maturation of man.
See Liber 777 Col. VII [0], Key Scales 3 through 9 inclusive. Also note that Key Scales 4 through 9 in Col. XCVII, excluding Saturn in old age, correspond to the "Ruach," "soul," "mind," or (one could say) "post-bicameral ego" of man.
I sat down and divided my own life into thematic epochs not long ago. Mine are split differently and more specifically to my own lived experience but I, too, arrived at the fact that I'm entering #5 in my mid-30s. Interesting coincidence!
I've always thought that I'm just extremely late to mature. I'm 36 now and haven't really felt like I sort of "get" things until my early 30s. My 20s were full of learning experiences, failures, and addiction to doing whatever the hell I wanted. I got a puppy with my wife at 29 and it felt like my life was over. This all really makes a lot of sense to me. It also makes me wonder why the human body rewards young parents when their brains are just simply not fully finished cooking. I couldn't have imagined raising a child at 22 with the way I acted and how important freedom was to me. I would've simply been a miserable father.
Thousands of generations of parents had children much younger than today. I think we’re too worried about having everything perfect and de-risked these days. Also realize that parenting is what grew me up. I don’t think people are ever “ready”
> I've always thought that I'm just extremely late to mature. I'm 36 now and haven't really felt like I sort of "get" things until my early 30s.
I'm 43 and I'm still not convinced that I'm not three kids stacked in a trench coat.
I remember being 33 and buying a house and thinking "Someone call the cops, this banker is letting a child sign mortgage papers".
When I put on nice clothes for a fancy dinner, I feel like I'm cosplaying as a functional and responsible adult, despite having a great career (Staff-level engineer that will likely be promoted to Principal in a few months). I fly First Class and feel out of place, like First Class is reserved for people that have their shit together.
Someone said that this feeling goes away when your same-gendered parent dies, but my dad passed in 2019 and it's still pervasive.
"Everything before 40 is research" I once heard, and every day, I find it to be more true.
I'm a great parent because it is what is necessary and my children had no choice or consent in existing, but I also tell anyone younger that unless they are absolutely sure they want kids and are ready for decades of suck, don't do it [1] [2] [3]. Live your best life, be true to yourself, find your passion and joy exploring and being curious; one can do this without children. If one needs kids to mature or become a better human, find a therapist first. Also, maturity is optional. You have to grow old, you don't have to grow up (take on responsibility unnecessary to take care of yourself, broadly speaking). Religious beliefs aside (potential reincarnation and whatnot), enjoy life, you only get one run through your part of the timeline. Don't waste it on the expectations or belief systems of others.
[1] (lack of support systems, both social and familial, ~$380k in 2025 dollars to raise a child 0-18 in the US not including daycare and college, etc; n=1, ymmv)
Just because people can physically, biologically have children does not automatically imply that they can - or should - be the only ones to raise the children. Children used to be a community effort; the US strayed from this a long time ago. Of course it would be much harder to raise a kid at 22 (or 16, or) than 40!
We used to have grandparents around and extended family. Think about how different life was 50,100 or, 500 years ago. Not enough time for evolution to respond
>At around the age of 32 the strongest overall shift in trajectory is seen. Life events such as parenthood may play a role in some of the changes seen, although the research did not explicitly test this. “We know that women who give birth, their brain changes afterwards,” said Mousley. “It’s reasonable to assume that there could be a relationship between these milestones and what’s happening in the brain.”
>From 32 years, the brain architecture appears to stabilise compared with previous phases, corresponding with a “plateau in intelligence and personality” based on other studies. Brain regions also become more compartmentalised.
--
I felt this 32-year-old shift, but later (now 43). I joke with friends that I was a bone-head like most males until about 30. Joke yes, but feels right.
Prior to 30ish, I was more insecure. Lacking in emotional intelligence. My conclusions from my experience, not projections from what I've read about that time.
My career and relationship history reflect that switch-flip in a way. Only during the second half of my 30s did I begin to feel more secure and more confident in my career, despite not achieving some outrageous senior position or level of income. That career is now in a better and more measured place - in which I recognize what I do well and what I don't do well, and don't beat myself to a pulp for not having "it"
Only in my 30s did I robustly embrace the power of compromise in friendships and relationships. Now I'm near 10 years married (and happy, most of it, let's be real) with two wonderful kids.
And now I'm much capable of reasoning with my anxities, emotions, and insecurities. Do I still ruminate? Yes. Do I still react? Yes. But I know how to redraw situations to reset my in-moment feelings and/or avoid unecessary negative action.
I don’t know about any of this “era” stuff but I do know and believe in just how much becoming a parent has changed me. It completely overhauled the calculus on what’s important in life. It’s given me a very clear main quest line, relegating all kinds of things I used to think were important to the “side quests” category.
And it has had positive side effects too. It’s incredibly useful to be uninterested in promotions and raises. To want to work less, not be paid more. It makes it easy to say and do the right thing rather than the self-preserving thing or self-promoting thing. It’s kind of ironic because I think that makes me better at my job.
It’s quite calming to have such a clear identity. There really is a peacefulness to knowing, at all times, where my compass points.
As the authors mentioned, ~30 years is the age many people have kids, and it is already well known that female brain changes after giving birth, for example. The authors didn't research if being a parent can explain a part of the difference (and also if parent brains are any different than childless people brains).
I'm personally curious about this: I'm slightly above 30, I observed significant changes in my behavior recently... and I became a parent this year.
Just a heads up, the female brain changes are reverted 1 year after giving birth (that's what the health professionals told us).
They also discovered that the male brain changes too.
I felt way more empathetic during the first year my son and my daughter were born, but I feel like I lost that part of me. I kinda miss it
Are you insinuating that childless people never fully mature? Because as a childless person I've noticed that a lot of the distance I felt with my friends with kids disappeared as soon as their kids were grown. Essentially we're all childless now, and think of the world in the same terms.
So .. the thing is, this is a descriptive account of the biology of the brain. However, I sometimes see the "discourse machine" building narratives around pushing the age of majority later, and I suspect this will get used in ammunition for normative purposes.
Just when the "brain doesn't finish developing until 25" nonsense has finally waned from the zeitgeist, here comes a new pile of rubbish for people to latch onto. Not that the research itself is rubbish, but how they name/describe the phases certainly is. The "adolescent" and "adult" phases don't have any correspondence to what we normally think of as those developmental periods. That certainly wont stop anyone from using this as justification for whatever normative claim they want to make though. It's just irresponsible.
Seems a stretch to use this as the basis of any radical change like raising the voting age to 32 (although maybe it supports reducing the minimum presidential age from 35 to 32!), but it does perhaps suggest looking at what kind of soft-paternalistic structures might help “adolescents” make better life choices. It is a little absurd that we expect an 18 year old to navigate the world with the same competence as a 40 year old.
You're uneasy because you're a frequent advocate for policy positions that most people tend to be weary of once they've accrued some amount of life experiences (although the experiences and speed of acquisition differ from individual to individual) hence anything that casts shade upon the decision making of the youngest adults is a potential threat to your goals, if only a theoretical and circuitous one at that. If such policy positions do not survive life experience are they worth advocating for? 100yr ago people has been treated by the world around them as adults for at least half a decade by the time they got to vote at 21. Why not do the same today?
Regardless, specific policy implications are totally beside the point.
The problem with this "well you're not akshually an adult until X" stuff is that it is basically a re-hash of long out of fashion "women are hysterical, blacks have big muscles and small brains" type crap from 200yr ago that was used as a justification to continue preventing these people from finding their own way in life unbounded, consequences and all. First off, the logic is flawed and self referential, of course housewives and slaves couldn't adult, they never had the opportunity to gain the experience, same with 22yo college kids you're measuring today. Removing the racism and sexism by simply applying it to everyone doesn't change the flawed logic. But that's not even the big problem. The big problem is that at a societal level you're reducing the number of person-years available for full adult capacity work and productivity. You can solve this with coercion (state, social norms, etc), but people are less productive when they're not working for themselves so you're still handicapping your own society. A society that does not encourage people to develop and become adult and achieve and produce at full capacity as quickly as possible (which is likely a different timetable in an agrarian society than an industrial one, details left as exercise for the reader) WILL eventually be outcompeted by one that does, though a head start may buy time.
I don't know if it was adulhood, but after 30 I started feeling calmer & more adult than before.
There was no special event in my life that kickstarted this, it was tge beginning of a more mature way to look at things & people. I started to see some repeated events & behaviours that I had already experienced and this also contributed to have a more tempered way to manage things.
As you age of course you still face unknown things, but you star to see that supposed new things rhyme with things you already know.
The stats warrant some caution, though. The main finding is based on figure 4 [1] and I wouldn't be surprised if the number and location of these 'eras' varied a lot if the authors use 40,000 people instead of 4,000.
Especially the last era - over 83 - is suspicious. With 4000 people and ages 1-90, how certain can we be about this? But I don't want to cast unjustified doubt, I'm sure they did the math.
Thanks for sharing the longitudinal brain-development framework from the Cambridge study. However, I don’t see strong direct practical value for an individual or educator in the life-stage breakdown (~birth–9, ~9–32, ~32–66, ~66–83, ~83+) beyond broad observation.
In contrast, frameworks from learning theorists such as Vygotsky, Piaget, Bloom, Gagné, Maslow, Bruner and Kolb provide more explicit actionable guidance for parents/teachers (e.g., scaffolding learning in the “zone of proximal development”, designing spiral curricula, applying experiential learning cycles).
My perspective guides me to prefer the pragmatic actionable frameworks. That help someone guiding children (or students) set norms, limits and scaffold growth in daily practice.
I do like the conversation that's cropping up here though from this article. A lot of lovely self-reflection.
I question the correlation and causality. I wonder how much of these eras are caused by brain physiology and genetics versus changes in the behavior with age, which can even be caused by external sociological factors, for example. Or a mix of both.
> From 32 years, the brain architecture appears to stabilise compared with previous phases, corresponding with a “plateau in intelligence and personality”.
For example, here - is this *caused* by genetics, or is it because in today's society this is about the age when you have finished your schooling and first working experiences and have simply less to learn?
I know my examples simplify the reasoning, but the question about causality still stands, I think.
Yeah I could distinctly feel my brain shifting into its adult era over the last couple of years (I'm 31)
It was kind of odd. I'm more serious now (but at the same time.. less?). I'm way more easily able to focus on what actually matters in this life. (In saying that, I think it's more likely that my brain has finally decided what's important... in a way I feel like a passenger)
I have the exact same feeling. Turning 30 was like flipping a switch for me. Since then, I've even felt like I've become more intelligent, especially in math. It's like everything suddenly clicked. I struggled with math throughout my entire school life, but now that I've gone back to college, I'm amazed by how easily I grasp concepts. I've recently taken on challenges that I always thought were exclusive to "smart people," like systems programming in Rust and Zig or building compilers.
This study seems like finding a way to quantify the well known and then twisting it to make a good headline.
People don't grow up until they need to. Of course you're gonna see college educated rich westerners delay whatever mental markers you're looking at. And likewise people who "stay active" seem to stave off the mental decline of old age.
Exactly this. With a comfy life, you can mature later. The more hardships and adversity one must overcome the faster that maturation happens. Particularly so when the hardships put one on an abnormal path.
Losing a close relative or a job is normal adversity that everyone will go through but not everyone has. Going through those other things while having a different philosophy or life ethos than those around you, thus also causing you to prioritize and pursue different things in life adds a different layer of challenge. That causes you to have to figure stuff out on your own and thus contributes to maturing in a different manner and at a different rate.
So a while back, I was interviewing business people still active in their 80s and 90s -- as part of a very intriguing project that got cut short but did produce some fascinating notes. I remember asking one 95-year-old guy still serving (competently) on a bank board if there was anything that he did better now than when he was in his 60s.
His answer: "I'm a better writer."
The Cambridge research cited in this study categorizes late-life changes in brain function as nothing but declining capability, all the way down. My guess is they are mostly right. But I'm intrigued by the notion that some of that elder erosion might lead to new clarity about how everything fits together.
I am 55 but my brain tells me I am 35 or 40. This is not a "crisis of the 50s'", I did not change anything in the way I behave, it is just that I somehow stopped changing my behavior when I was around 35-40. This was not intended and it is only now that I realized it.
When I look at pictures from this time, I am very similar. I aged of course but the clothes and behavior is the same. The interests are the same. My opinions and overall maturity is the same. It does not mean that they are great, just that they do not change.
I wonder when the next change will be, when I will look at the past and say "I changed"
I’m in my early 40s and went through a really intense, almost midlife crisis type period at the start of this year that turned out to be surprisingly transformative. I have come out of it feeling more patient, focused, confident, kind, and much better at honest self‑reflection. It’s just one anecdote, but my working theory is that people hit these developmental turning points at different times; some earlier, some later. studies like this make me wonder how much of that is brain wiring catching up with the lives we have lived so far
I definitely felt older back in my early thirties, but I feel like I got younger now in my mid 40s. I think it's because my kid is in college and doesn't need me as much as they used to. Plus, I'm debt free and make enough money to not worry about the cost of going out.
In my late 20s/early 30s I was under water on my house, not getting paid enough, and had a small child. It was clear that I had to step up and "be a man." Which, I intuitively think had a bigger effect on me than simply getting older.
At age 58, going on 59, I'm feeling an alarming decline in physical (luckily not mental at this point) ability. Sure enough, men have relatively abrupt aging events at about 44 and 60. I hope that's what it is and it's not still coming and making things even more pathetic.
So I have, on average, another 7 years until I'm officially a typical old man? Great, just great.
But I can vouch for the earlier milestone. I grew up as a socially challenged geek with nobody to tell me that I'm just wired differently and it's not my fault, I didn't somehow not do my homework, that I'm not like the cool kids. Right around age 30 I had this epiphany... this is how I am! Instead of always looking for someone or something to teach me how I think I should be... just embrace what, in fact, I am. If I'm a geek, then just live my life best as a geek. The resulting increase in self-confidence did help socially. So just another prerogrammed "adulting" threshold? Maybe.
Support for part of this from another source. I've read through the collected letters of many famous intellectuals (just for hobby), and I've noticed a common dramatic shift in personality starting around age 28-30. People become more attentive to the needs of others and their own role in a network of social responsibilities. It's no longer "me, me, me".
Anecdotally I’ve felt this shift over the past few years. I am 33 and have always been a huge proponent of personal growth, change, pushing yourself to be better. In the past few years Ive felt the opposite urge, an urge to accept myself, flaws and all, as the hand I’ve been dealt and I must merely play that hand, not focus so much on what-ifs, etc. Perhaps this is my brain solidifying.
There is wisdom both in trying to change what you can, and realizing that you maybe can't change everything. If you've been trying to change things, by 33 you may have a fair idea of what you in fact cannot change.
29 and feeling the same. It's kind frustrating and freeing at the same time. I feel like I'm making less progress, but at the same time don't feel the pressure to make progress.
I'd also like to add anecdotally that a lot of people develop burnout at that age, probably because they keep pushing themselves and/or get sucked into their own enthusiasm / passion instead of set limits and the like. But then, I also think people get less resilient to stress and the like after 30, less able to compartimentalize or bounce back quickly.
What you end up getting is people ~10 years into an exciting career where suddenly they can't perform or cope as well as they used to. But they can also be in a pretty senior position by then and be pushed out of their comfort zone.
> based on the brain scans of nearly 4,000 people aged under one to 90, mapped neural connections and how they evolve during our lives.
That is an absurdly small sample size to make such a conclusion.
It seems this age range could at least partly be culturally attributed. In modern industrialized life, many people don't have to "grow up" until a later age. At the risk of generalizing, people have more support from family, friends, and society at large.
Is the forming of those neurons based on some natural law, or is that people just haven't had to live the experiences that do so until their 30's nowadays?
As far as I know, forming neurons isn't something that "just happens". It happens due to catalysts in life. In pre-modern society, and indeed most likely in under-industrialized nations today, those catalysts, those experiences, would happen earlier. As others mentioned, there is a clear correlation with the typical age in which modern society gets married, settles down, and has kids.
I wonder what that era age would have been 200+ years ago.
Not sure why this is downvoted.
The authors themselves note that parenthood could be a catalyst for the change at 30-- in previous centuries, when parenthood happened much earlier, why could it not affect the brain's timeline? This study is simply descriptive of a particular dataset, a collection of snapshots at a particular time and place. Certainly the brain is elastic and responsive to external conditions.
What I noticed is that the 4000 samples are all from England and the U.S. Replicating this study with a greater geographical and socio-cultural diversity would be very useful in supporting or expanding these results.
I do have felt similar shift around that age, but I wonder if it is due to reaching certain points in career where you are put into more leading position and have more confidence in what you do even if you don't have children? Easy to go into horoscope style confirmation bias here though.
Nonetheless I am never going to stop saying I still feel like I am 16. Just more confident 16.
at some point when i was 32 it hit me: "ive accepted the idea of giving up perceived freedom and having a kid" (adoption or old-fashioned-style)
my spouse is 3 years younger and when i told her my conclusion i added that i feel no urgency, only that something shifted
this was 3 years ago and now my spouse is 32 and said the same thing to me, someone who previously had NEVER wanted to go through the process of childbirth[0]. had to remind her that we had the same convo when i was her age
incredible that shift has been pinned down with research
[0] 10 years of big hospital nursing can be like "scared straight" for pregnancy
This is interesting and alarming to me because judging by the changes in my life I appear to have entered the age-66 phase more than a decade and a half early despite remaining intellectually curious and physically fit enough.
In the last year or so I have begun to adjust my life expectations. My father was in his nineties when he died, but I no longer believe I will reach my seventies.
Things like this only tend to confirm my sense that I am neurologically ageing at a rate that is unusual.
Bizarre. This says that most children are had by adolescents. And that they’ve always been mostly had by adolescents. Maybe this is an example of culturally-driven development? Or does this explain why there’s so many bad parents?
I think that environment is probably also a factor. My only parent died when I was a teen and I had to grow up really fast. I got a lot of things wrong but my brain did not have any other options either way.
Then when you're not on the era you're supposed to be it's called a "regression" or "skipping stages". People are very stubborn to classify development in terms of age or time.
I had kids and finally settled into a career at 33. It certainly forced me into adult mode after this.
I just met up with my Brother-in-law and his friends for our yearly gathering. All of them are in their 30s and none of them are in what I would consider 'adult mode'.
They are all un-married/no kids, barely scraping by, partying every weekend/wasting money on weed and booze. Certainly no careers (mostly retail, some unemployed and still living with parents).
I wonder if these numbers will change with the new generation, because so many are not having kids or getting married.
I know plenty of people that had kids in their 20's - still didn't 'grow up' until their 30's. Just because they're not partying anymore doesn't mean they still don't act like adolescents when navigating complicated situations they're in (because they're had kids before they were necessarily 'ready') compared with someone in their 30's. I would argue that taking away that time in your late 20's where you can more easily make mistakes and try new things (while also having a bit of stability in terms of money) before having kids will lead to less maturity rather than more long term.
Wasn't it 25 that the prefrontal cortex matured and people could be considered adults? We will have to infantilize people until their 30s now?
The problem with such reports (the studies themselves method-wise etc are in general fine I guess, but how the results are interpreted and disseminated is the issue) is that unless we find some specific correlations with behavioural and such measures, it makes no sense to give these kind of meanings such as "adolescence", adult mode", behavioural/mental/cognitive matureness or whatever cultural or other norms one may think a "mature/adult person" should abide to. Especially since these abstract topological measures, while interesting, are not that trivially linked with real outcomes in a causal sense, and instead of eg simply reflecting rather environmental or other changes in a person's life.
I haven't read this paper, but for the "25" paper, it was a longitudinal study that stopped observing people at 25. The result "brain continues to develop up to at least age 25" was misinterpreted as "stops developing at age 25" by media & social media.
I have similar concerns about reporting on this paper - feels ripe for pop-sci misunderstandings.
I've always found it interesting that laws are set by politics to allow privileges at certain ages (16, 18, 21), but car rental companies - whose motives are more purely data-driven - won't rent to anyone under 25.
I'm certainly not advocating withholding suffrage until 25, but driving... the data is very strong that it would save lives.
> We will have to infantilize people until their 30s now?
People already pick and choose who they feel sympathy for and give a pass to on the basis of their personal experiences, belief system, and social proximity. Think of how many, for instance, ridicule politicians for being too saintly and enabling or mean and without empathy then give their friends and family a pass for the exact same behavior. They'll get angry with celebrities for things that they allegedly did then shrug off a driver running a red light and nearly killing them because they "don't take things personally". Addicts are a blight on society until it's somebody's child or brother or sister in which case they just need help. Et cetera ad infinitum.
People (you and I included) are fickle. This changes nothing.
People really miss the point about why military recruiting occurs so early at 18. The brain is not fully developed yet. At 18, people have not learned right from wrong, love, death, loss, true responsibility to someone else. Sure, someone at 18 have gone through these things and it hopefully helps guide them in life, but it may not penetrate the brain as a life lesson yet. The brain is basically a blur up until your thirties, because you don't have any of these experiences to compare to until you encounter them again.
That's why as you get older you start to understand what the heck is happening in your life, because you finally have multiple experiences to compare to. Then you can finally understand what is meant to be traumatic and what is right and wrong. The first time you went through something you were basically numb to the experience.
Semantics sure. But adult mode starts most likely at 13.
Early 30s is mid-life mode.
Why? Because time and time again research shows we should treat people 13 and up as adults. Even when they get some extra years of youth-judgement in court, and we put 18/21 in place as lawful adult...
Once again armchair evolutionary psychologists are ahead of science. Science dismisses the amateur sociologists online who share anecdotes and observations, but they should really try to test these theories.
Except the five eras in the article are based scientific observations of how the brain changes overtime where’s yours are based on having a snide attitude.
slfnflctd|3 months ago
Like most such things, I'd expect this to be a spectrum, and I may be somewhat of a late bloomer. Regardless, I have a theory that there is somewhat of a protective effect operating here. Believing in a simpler reality which involved future wish fulfillment for me - however unrealistic it was - may have helped me survive. Coming to acceptance of what I see as a more accurate but far bleaker perspective required me to grow strong enough to sustain my will to live despite that perspective.
Biggest lesson learned: I could not do it without at least one other person (or more) who I trust almost 100% with all of myself. Realizing that going it alone is futile is definitely part of what I consider becoming an adult, and it can take a long time to fully accept that.
mapontosevenths|3 months ago
Its strange. The biggest lesson I learned was almost the opposite: I learned that the meaning of life has nothing to do with other people or their estimation of me. It has more to do with who you are when there is nobody else around. Other people often act as a sort of fun house mirror that distort and reflect back a false image.
Learning to be happy alone and seeing through the pleasant lies is absolutely vital to becoming an adult.
frikskit|3 months ago
zwnow|3 months ago
Weird, for me its the complete opposite. I accepted to live alone for the rest of my life because a) I am undesired and I wont make a move. b) I barely met people I would even consider it being worth talking to, I need to feel equal on a cognitive level and not a lot of people match that requirement. I either feel lesser or above.
SoftTalker|3 months ago
nradov|3 months ago
unknown|3 months ago
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motbus3|3 months ago
moomoo11|3 months ago
So if you were childlike before in your thinking I guess at least you’re a college student now.
nine_zeros|3 months ago
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antognini|3 months ago
1. Infancy --- The Moon. Since the Moon waxes and wanes more rapidly than any other celestial object, this period is characterized by the fastest development.
2. Childhood --- Mercury. As Mercury is the fastest of the planets, at this age children have the short attention spans and flit from one thing to the next.
3. Youth --- Venus. Starting around puberty, a man's mind starts to become focused on love.
4. Young Adulthood --- The Sun. A man comes of age, he starts to think about his work and people begin to take him seriously.
5. Middle Adulthood --- Mars. In his mid 30s a man's demeanor becomes more severe. He realizes he has certain goals he would like to accomplish and there is not much time left to achieve them.
6. Maturity --- Jupiter. By his mid 50s, having achieved what he can in his life, he has arrived at a position of authority in the community. He has gravitas and respect.
7. Old Age --- Saturn. By his late 60s, he starts to decline physically and mentally.
ryandv|3 months ago
See Liber 777 Col. VII [0], Key Scales 3 through 9 inclusive. Also note that Key Scales 4 through 9 in Col. XCVII, excluding Saturn in old age, correspond to the "Ruach," "soul," "mind," or (one could say) "post-bicameral ego" of man.
[0] https://ia902906.us.archive.org/22/items/Liber777Revised/Lib...
alexjplant|3 months ago
volkk|3 months ago
goalieca|3 months ago
Sohcahtoa82|3 months ago
I'm 43 and I'm still not convinced that I'm not three kids stacked in a trench coat.
I remember being 33 and buying a house and thinking "Someone call the cops, this banker is letting a child sign mortgage papers".
When I put on nice clothes for a fancy dinner, I feel like I'm cosplaying as a functional and responsible adult, despite having a great career (Staff-level engineer that will likely be promoted to Principal in a few months). I fly First Class and feel out of place, like First Class is reserved for people that have their shit together.
Someone said that this feeling goes away when your same-gendered parent dies, but my dad passed in 2019 and it's still pervasive.
toomuchtodo|3 months ago
I'm a great parent because it is what is necessary and my children had no choice or consent in existing, but I also tell anyone younger that unless they are absolutely sure they want kids and are ready for decades of suck, don't do it [1] [2] [3]. Live your best life, be true to yourself, find your passion and joy exploring and being curious; one can do this without children. If one needs kids to mature or become a better human, find a therapist first. Also, maturity is optional. You have to grow old, you don't have to grow up (take on responsibility unnecessary to take care of yourself, broadly speaking). Religious beliefs aside (potential reincarnation and whatnot), enjoy life, you only get one run through your part of the timeline. Don't waste it on the expectations or belief systems of others.
[1] (lack of support systems, both social and familial, ~$380k in 2025 dollars to raise a child 0-18 in the US not including daycare and college, etc; n=1, ymmv)
[2] Parents Under Pressure: The U.S. Surgeon General's Advisory on the Mental Health & Well-Being of Parents - https://www.hhs.gov/sites/default/files/parents-under-pressu... - 2024
[3] The American dream will cost you $5 million, report finds - https://www.axios.com/2025/09/22/the-american-dream-will-cos... - September 22nd, 2025
genewitch|3 months ago
Qem|3 months ago
Probably so that they can grow with their children.
tayo42|3 months ago
grvdrm|3 months ago
>From 32 years, the brain architecture appears to stabilise compared with previous phases, corresponding with a “plateau in intelligence and personality” based on other studies. Brain regions also become more compartmentalised.
--
I felt this 32-year-old shift, but later (now 43). I joke with friends that I was a bone-head like most males until about 30. Joke yes, but feels right.
Prior to 30ish, I was more insecure. Lacking in emotional intelligence. My conclusions from my experience, not projections from what I've read about that time.
My career and relationship history reflect that switch-flip in a way. Only during the second half of my 30s did I begin to feel more secure and more confident in my career, despite not achieving some outrageous senior position or level of income. That career is now in a better and more measured place - in which I recognize what I do well and what I don't do well, and don't beat myself to a pulp for not having "it"
Only in my 30s did I robustly embrace the power of compromise in friendships and relationships. Now I'm near 10 years married (and happy, most of it, let's be real) with two wonderful kids.
And now I'm much capable of reasoning with my anxities, emotions, and insecurities. Do I still ruminate? Yes. Do I still react? Yes. But I know how to redraw situations to reset my in-moment feelings and/or avoid unecessary negative action.
Waterluvian|3 months ago
And it has had positive side effects too. It’s incredibly useful to be uninterested in promotions and raises. To want to work less, not be paid more. It makes it easy to say and do the right thing rather than the self-preserving thing or self-promoting thing. It’s kind of ironic because I think that makes me better at my job.
It’s quite calming to have such a clear identity. There really is a peacefulness to knowing, at all times, where my compass points.
Esophagus4|3 months ago
Sounds like a stage of brain development I haven’t reached yet :)
[sent from my steady state of pulp]
integralid|3 months ago
I'm personally curious about this: I'm slightly above 30, I observed significant changes in my behavior recently... and I became a parent this year.
Fire-Dragon-DoL|3 months ago
I felt way more empathetic during the first year my son and my daughter were born, but I feel like I lost that part of me. I kinda miss it
jewayne|3 months ago
wolttam|3 months ago
pjc50|3 months ago
hackinthebochs|3 months ago
jl6|3 months ago
potato3732842|3 months ago
Regardless, specific policy implications are totally beside the point.
The problem with this "well you're not akshually an adult until X" stuff is that it is basically a re-hash of long out of fashion "women are hysterical, blacks have big muscles and small brains" type crap from 200yr ago that was used as a justification to continue preventing these people from finding their own way in life unbounded, consequences and all. First off, the logic is flawed and self referential, of course housewives and slaves couldn't adult, they never had the opportunity to gain the experience, same with 22yo college kids you're measuring today. Removing the racism and sexism by simply applying it to everyone doesn't change the flawed logic. But that's not even the big problem. The big problem is that at a societal level you're reducing the number of person-years available for full adult capacity work and productivity. You can solve this with coercion (state, social norms, etc), but people are less productive when they're not working for themselves so you're still handicapping your own society. A society that does not encourage people to develop and become adult and achieve and produce at full capacity as quickly as possible (which is likely a different timetable in an agrarian society than an industrial one, details left as exercise for the reader) WILL eventually be outcompeted by one that does, though a head start may buy time.
readthenotes1|3 months ago
yomismoaqui|3 months ago
There was no special event in my life that kickstarted this, it was tge beginning of a more mature way to look at things & people. I started to see some repeated events & behaviours that I had already experienced and this also contributed to have a more tempered way to manage things.
As you age of course you still face unknown things, but you star to see that supposed new things rhyme with things you already know.
erfgh|3 months ago
pfd1986|3 months ago
The stats warrant some caution, though. The main finding is based on figure 4 [1] and I wouldn't be surprised if the number and location of these 'eras' varied a lot if the authors use 40,000 people instead of 4,000.
[1] https://www.nature.com/articles/s41467-025-65974-8/figures/4
integralid|3 months ago
cyrusradfar|3 months ago
In contrast, frameworks from learning theorists such as Vygotsky, Piaget, Bloom, Gagné, Maslow, Bruner and Kolb provide more explicit actionable guidance for parents/teachers (e.g., scaffolding learning in the “zone of proximal development”, designing spiral curricula, applying experiential learning cycles).
My perspective guides me to prefer the pragmatic actionable frameworks. That help someone guiding children (or students) set norms, limits and scaffold growth in daily practice.
I do like the conversation that's cropping up here though from this article. A lot of lovely self-reflection.
alentred|3 months ago
> From 32 years, the brain architecture appears to stabilise compared with previous phases, corresponding with a “plateau in intelligence and personality”.
For example, here - is this *caused* by genetics, or is it because in today's society this is about the age when you have finished your schooling and first working experiences and have simply less to learn?
I know my examples simplify the reasoning, but the question about causality still stands, I think.
escapecharacter|3 months ago
wolttam|3 months ago
It was kind of odd. I'm more serious now (but at the same time.. less?). I'm way more easily able to focus on what actually matters in this life. (In saying that, I think it's more likely that my brain has finally decided what's important... in a way I feel like a passenger)
SwiftyBug|3 months ago
potato3732842|3 months ago
People don't grow up until they need to. Of course you're gonna see college educated rich westerners delay whatever mental markers you're looking at. And likewise people who "stay active" seem to stave off the mental decline of old age.
lemonwaterlime|3 months ago
Losing a close relative or a job is normal adversity that everyone will go through but not everyone has. Going through those other things while having a different philosophy or life ethos than those around you, thus also causing you to prioritize and pursue different things in life adds a different layer of challenge. That causes you to have to figure stuff out on your own and thus contributes to maturing in a different manner and at a different rate.
GCA10|3 months ago
His answer: "I'm a better writer."
The Cambridge research cited in this study categorizes late-life changes in brain function as nothing but declining capability, all the way down. My guess is they are mostly right. But I'm intrigued by the notion that some of that elder erosion might lead to new clarity about how everything fits together.
BrandoElFollito|3 months ago
I am 55 but my brain tells me I am 35 or 40. This is not a "crisis of the 50s'", I did not change anything in the way I behave, it is just that I somehow stopped changing my behavior when I was around 35-40. This was not intended and it is only now that I realized it.
When I look at pictures from this time, I am very similar. I aged of course but the clothes and behavior is the same. The interests are the same. My opinions and overall maturity is the same. It does not mean that they are great, just that they do not change.
I wonder when the next change will be, when I will look at the past and say "I changed"
bicepjai|3 months ago
dec0dedab0de|3 months ago
In my late 20s/early 30s I was under water on my house, not getting paid enough, and had a small child. It was clear that I had to step up and "be a man." Which, I intuitively think had a bigger effect on me than simply getting older.
MarkusWandel|3 months ago
So I have, on average, another 7 years until I'm officially a typical old man? Great, just great.
But I can vouch for the earlier milestone. I grew up as a socially challenged geek with nobody to tell me that I'm just wired differently and it's not my fault, I didn't somehow not do my homework, that I'm not like the cool kids. Right around age 30 I had this epiphany... this is how I am! Instead of always looking for someone or something to teach me how I think I should be... just embrace what, in fact, I am. If I'm a geek, then just live my life best as a geek. The resulting increase in self-confidence did help socially. So just another prerogrammed "adulting" threshold? Maybe.
wrp|3 months ago
baerrie|3 months ago
AnimalMuppet|3 months ago
jamespattn|3 months ago
Cthulhu_|3 months ago
What you end up getting is people ~10 years into an exciting career where suddenly they can't perform or cope as well as they used to. But they can also be in a pretty senior position by then and be pushed out of their comfort zone.
GrumpyGoblin|3 months ago
That is an absurdly small sample size to make such a conclusion.
It seems this age range could at least partly be culturally attributed. In modern industrialized life, many people don't have to "grow up" until a later age. At the risk of generalizing, people have more support from family, friends, and society at large.
Is the forming of those neurons based on some natural law, or is that people just haven't had to live the experiences that do so until their 30's nowadays?
As far as I know, forming neurons isn't something that "just happens". It happens due to catalysts in life. In pre-modern society, and indeed most likely in under-industrialized nations today, those catalysts, those experiences, would happen earlier. As others mentioned, there is a clear correlation with the typical age in which modern society gets married, settles down, and has kids.
I wonder what that era age would have been 200+ years ago.
GeoAtreides|3 months ago
Please show the statistical calculations in support of such assertion.
AHatLikeThat|3 months ago
What I noticed is that the 4000 samples are all from England and the U.S. Replicating this study with a greater geographical and socio-cultural diversity would be very useful in supporting or expanding these results.
mewpmewp2|3 months ago
Nonetheless I am never going to stop saying I still feel like I am 16. Just more confident 16.
jewayne|3 months ago
boogieknite|3 months ago
my spouse is 3 years younger and when i told her my conclusion i added that i feel no urgency, only that something shifted
this was 3 years ago and now my spouse is 32 and said the same thing to me, someone who previously had NEVER wanted to go through the process of childbirth[0]. had to remind her that we had the same convo when i was her age
incredible that shift has been pinned down with research
[0] 10 years of big hospital nursing can be like "scared straight" for pregnancy
exasperaited|3 months ago
In the last year or so I have begun to adjust my life expectations. My father was in his nineties when he died, but I no longer believe I will reach my seventies.
Things like this only tend to confirm my sense that I am neurologically ageing at a rate that is unusual.
clickety_clack|3 months ago
unknown|3 months ago
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RansomStark|3 months ago
[0] https://andreian.com/hobbits-coming-of-age/#:~:text=What%20y...
jleyank|3 months ago
Bender|3 months ago
ranyume|3 months ago
billy99k|3 months ago
I just met up with my Brother-in-law and his friends for our yearly gathering. All of them are in their 30s and none of them are in what I would consider 'adult mode'.
They are all un-married/no kids, barely scraping by, partying every weekend/wasting money on weed and booze. Certainly no careers (mostly retail, some unemployed and still living with parents).
I wonder if these numbers will change with the new generation, because so many are not having kids or getting married.
dangus|3 months ago
The median income almost doubles between age 23 and 35.
basisword|3 months ago
y0eswddl|3 months ago
freehorse|3 months ago
The problem with such reports (the studies themselves method-wise etc are in general fine I guess, but how the results are interpreted and disseminated is the issue) is that unless we find some specific correlations with behavioural and such measures, it makes no sense to give these kind of meanings such as "adolescence", adult mode", behavioural/mental/cognitive matureness or whatever cultural or other norms one may think a "mature/adult person" should abide to. Especially since these abstract topological measures, while interesting, are not that trivially linked with real outcomes in a causal sense, and instead of eg simply reflecting rather environmental or other changes in a person's life.
fwip|3 months ago
I have similar concerns about reporting on this paper - feels ripe for pop-sci misunderstandings.
IAmBroom|3 months ago
I've always found it interesting that laws are set by politics to allow privileges at certain ages (16, 18, 21), but car rental companies - whose motives are more purely data-driven - won't rent to anyone under 25.
I'm certainly not advocating withholding suffrage until 25, but driving... the data is very strong that it would save lives.
alexjplant|3 months ago
People already pick and choose who they feel sympathy for and give a pass to on the basis of their personal experiences, belief system, and social proximity. Think of how many, for instance, ridicule politicians for being too saintly and enabling or mean and without empathy then give their friends and family a pass for the exact same behavior. They'll get angry with celebrities for things that they allegedly did then shrug off a driver running a red light and nearly killing them because they "don't take things personally". Addicts are a blight on society until it's somebody's child or brother or sister in which case they just need help. Et cetera ad infinitum.
People (you and I included) are fickle. This changes nothing.
iJohnDoe|3 months ago
That's why as you get older you start to understand what the heck is happening in your life, because you finally have multiple experiences to compare to. Then you can finally understand what is meant to be traumatic and what is right and wrong. The first time you went through something you were basically numb to the experience.
Qem|3 months ago
I thought it was because if people die in battle at that age, they were statistically unlikely to leave widows and children to collect pensions.
riazrizvi|3 months ago
Fire-Dragon-DoL|3 months ago
mythrwy|3 months ago
unknown|3 months ago
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IAmBroom|3 months ago
cies|3 months ago
Early 30s is mid-life mode.
Why? Because time and time again research shows we should treat people 13 and up as adults. Even when they get some extra years of youth-judgement in court, and we put 18/21 in place as lawful adult...
lutusp|3 months ago
Q: "Is this based on a clearly expressed scientific theory?"
A: "Be serious -- it's just an idea, a narrative."
Q: "What would constitute a basis for either statistical validation or falsification?"
A: "You're confusing psychology with science. That's naive."
phendrenad2|3 months ago
john-carter|3 months ago
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Joshua-Peter|3 months ago
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fidelity2482|3 months ago
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crazygringo|3 months ago
speedylight|3 months ago
thedudeabides5|3 months ago