There’s “strong evidence that if there is a maximum limit to human lifespan, we are not close to it yet,” Kenneth Wachter, a demographer and statistician at the University of California, Berkeley.
But what that maximum is—the current longevity record is 122—remains to be seen,
Joop de Beer, demographer of the Netherlands Interdisciplinary Demographic Institute in The Hague
The plateau may occur because frailer people gradually die off, leaving only the toughest alive.
Many factors, including genes, likely account for their hardiness…”
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https://www.sciencemag.org/news/2018/06/once-you-hit-age-aging-appears-stop