Bryan Johnson· Author
night time erections is a biological age marker.
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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.
night time erections is a biological age marker.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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My total night time erections were 3h 2m + Giving me a penis biological age of 22
and so nighttime erections are actually a meaningful biological age marker