[menomatter]

Photoaging is the term and a quick search yields a few studies. Ex: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8802961/. And anecdotally, I never used sun screen and was exposed to a lot of sunburns in the Mediterranean climate. My skin is visibly older and more wrinkled than my peers who used skin protections. My back is full of freckles and dermatologist said this is due to sunburn. I guess sunburn doesn’t need a lot of studies to show it’s very damaging to the skin?

[memen]

That is kind of my point. Sun burn is not good. But without sun burn? The article you sent doesn't make clear whether photoaging always happens, or only on sun burn or other high doses of exposure.