Bryan Johnson· Author
Aging clocks are mostly a proxy (surrogate endpoint) for the actual endpoint of interest, which is lifespan itself (mortality data). Relying solely on mortality data would delay the field by several decades.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Aging clocks are mostly a proxy (surrogate endpoint) for the actual endpoint of interest, which is lifespan itself (mortality data). Relying solely on mortality data would delay the field by several decades.
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