Children born recently in regions with the oldest people are far from likely to become centenarians, with researchers predicting only 15% of females and 5% of males in the oldest-living areas will reach 100 this century.
The average global life expectancy rose from 48 in 1900 to 67 in 1950, and again to 76 by the turn of the millennium, but by 2021 it had only risen to 77, falling short of the expected 83 if rapid increases had continued.
There's reason to be optimistic that a second longevity revolution is approaching. Researchers are succeeding in slowing biological aging in various species, offering humanity a chance to alter the course of human survival. With the right investment in anti-aging research, we could see radical life extension again this century.