A biotech CEO on a quest for immortality says he wears a small device on his penis every night to measure how many erections he gets

• Bryan Johnson's quest for longevity has him tracking his nighttime erections. 
• The tech entrepreneur wears a tracking device on his penis to sleep every night, per Time.
• Johnson previously said he did shockwave therapy to stimulate his genitals.   

Biotech entrepreneur Bryan Johnson's desire to live forever led him to track his nighttime erections.

"I have, on average, two hours and 12 minutes each night of erection of a certain quality," Johnson told Time magazine's Charlotte Alter in a profile published on September 20.

Johnson wears a device on his penis to sleep every night to track his erections, per Alter's report.

Alter added in her story that Johnson's erection tracker appeared to resemble an Apple AirPods case, complete with a strap attached.

Johnson told Time that he estimates that he needs to clock an erection duration of three and a half hours to match an 18-year-old's virility.

Johnson's focus on his erections might have little to do with his love life. The CEO said in the interview that women are not his "number one priority."

Instead, Johnson told Time that he views nighttime erections as a "biological age marker for your sexual function."

And it's not just about tracking. Johnson previously said on X, the social media platform formerly known as Twitter, that he does shockwave therapy on his penis to get erections that resemble a teenager's.

Johnson embarked on his obsessive quest for longevity in 2021 when he launched his $2 million-a-year antiaging program, Project Blueprint.

To slow down his aging, Johnson observes a highly disciplined lifestyle of having dinner before noon and going to bed at 8:30 p.m. He also takes over 100 supplements daily, in pill form.

Jan Vijg, a genetics professor at the Albert Einstein College of Medicine, previously told Insider that there appears to be no science that supports Johnson's methods of prolonging his lifespan.

"If you expect to live significantly longer than, say, 115 — which is more or less the maximum lifespan of our species — then there is currently zero evidence this can be accomplished," Vijg said.

Representatives for Johnson did not immediately respond to a request for comment from Insider sent outside regular business hours.