Bryan Johnson· Author
. being a smoker predicts +1.2 years of skin age . every 5kg decrease in handgrip strength predicts +0.4 years skin age . every 1-category increase in nighttime awakenings predicts +0.24 year skin age
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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.
. being a smoker predicts +1.2 years of skin age . every 5kg decrease in handgrip strength predicts +0.4 years skin age . every 1-category increase in nighttime awakenings predicts +0.24 year skin age
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