Bryan Johnson· Author
Healthy men in their 20s can experience 3+ hours of nighttime erections in 3-5 erection episodes. This drops to under 50 minutes for those 75+ [1]
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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.
Healthy men in their 20s can experience 3+ hours of nighttime erections in 3-5 erection episodes. This drops to under 50 minutes for those 75+ [1]
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