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Biohacker Bryan Johnson is rejuvenating his penis - reveals how to check your 'erection age'
The longevity entrepreneur - who is 47 but has the body of a man in his 30s - revealed that measuring nighttime erections is one of the most important markers of health.
The longevity entrepreneur - who is 47 but has the body of a man in his 30s - revealed that measuring nighttime erections is one of the most important markers of health.
