[DennisP]

That's a big problem for the next several decades, but by the time longevity tech is mature enough to significantly affect populations, either we'll have converted to non-carbon energy or longevity tech will be pretty much irrelevant anyway.

[blagie]

I'm not sure:

- We might be sitting at a 500M population after the [climate / pandemic / AI / nuclear / system collapse / etc] apocalypse.

- We might be sitting on a terraformed Mars (or in bubbles under the ocean)

- We might be sitting in glass domes in the middle of an increasingly climate-hostile Earth

... and so on. We're very bad at predicting the future; it's hard to pick from thousands of (individually highly unlikely) possibilities.

[DennisP]

Right, but I didn't mean humans would be extinct necessarily, just that longevity tech would be mostly irrelevant to population counts. In a lot of those scenarios, the main causes of death are likely to be things like starvation, disease, or accidents, rather than old age.

Admittedly this isn't true of all possible scenarios. And in some, longevity would be really helpful.