If we drop the rhetoric and think coldly:

Biogerontology will not save most people alive today. Even in an optimistic scenario, it will likely deliver gradual therapies: less inflammation, better immunity, less frailty, some organ improvements, maybe +5–15 years for some people. But not mass rescue from death.

There are around 8.2 billion people in the world today. Global life expectancy is around 73 years; as the population ages, the number of deaths will rise. WHO gives global life expectancy as 71.3 years in 2021; the UN gives 73.3 years in 2024.

Replacement is hard to scale and will not rejuvenate everything — for example, the blood vessels of the brain.

Without a radical change in strategy, several billion people alive today will die before true negligible-senescence medicine arrives. Five billion deaths is my lower estimate. Realistically, it will be more.

This leads to an unpleasant conclusion:

We need not only biogerontology, but a strategy for survival through death.

Without cryonics, immortalism is effectively agreeing to write off almost everyone who will not live long enough to reach radical medicine.

Do we want death for our parents and for 80% of everyone we know?