[Rubinsalamander]

It would not only be for the rich. Healthcare cost are incredibly expensive especially later in live so governments have a strong inventive to provide it for everyone. Also people wont have to retire anymore (also great for government) The most expensive part about it would probably be research, but since every person on the planet is a potential user and there a big savings in Healthcare and Pension i don't see costs being a problem.

Humans dont progress in terms of biological evolution anymore but instead technologically. The increased lifespan would allow scientist to master multiple fields which would be great for progress.

[xlii]

Access to “high end” care (which I suppose would be one) is already high cost which is not that accessible even with technology presence.

As of 2019 1/3 of world’s population doesn’t have access to clean drinking water. Would they be glad that instead of clean water and sanitary conditions they were granted endless life?

It’s nice to focus on optimistic outcomes but except for genius scientists world is full of mobsters, greedy bankers and ruthless corporation heads. They’d had a chance for longevity way sooner than the best of scientists (who have “infinite memory” trait, which isn’t true even for the healthiest of humans).

Sure, we’re speculating (and it’s fun) but I’d invite to mix at least 30% of “what could go wrong” as part of the context.

Let’s have a thought experiment: who would be the first to get such treatment - Nobel prize winner or a dictator? What would be the route, who would pay for that, would they even want that (as that’s not guaranteed).

[Rubinsalamander]

Dictator could pay more for it but would probably be to paranoid to actually do it until its proven technologically. So my bet would be on the Noble Prize winner because of curiosity and good connections to the people working on the technology.

If the technology first emerges you could probably get it quite cheaply because its not proven yet. Afterwards there will be a scarity due to everyone wanting it which will drive prices up. In the long run it becomes a free commodity due to being a net saving for governments.

But even if the rich and ruthless get it first, that doesnt matter much in the long run. Medical improvements tend to get cheaper with time. The incentives are there to provide it to everyone. And especially so in a democracy.