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graphic of silhouette of person with brainwaves

Peter Diamandis, a week away from turning 63, bounds out of a Starbucks on a recent morning with a cup of decaf, his daily medley of 70 supplement capsules in his pocket and, tucked under his left arm, a box of freshly deposited poop.

The serial entrepreneur is in the standard uniform of serial entrepreneurs: jeans, sneakers, fitted black T-shirt, Apple Watch, Oura Ring and puffer vest, the back of which says, “Life is short … until you extend it.”

“I woke up at 6. I meditated for 15 minutes. I took fecal samples — I hate to say that, unappetizing, sorry,” Diamandis says as he makes his way up Wilshire Boulevard. “Went through my dental protocol. Did push-ups and sit-ups and squats. And then came here.”

“Here” is a sixth-floor doctor’s office in Santa Monica, where the XPrize founder has been coming every few weeks to undergo therapeutic plasma exchange. The $7,500 procedure involves removing blood, running it through a machine to separate out the plasma and replace it with albumin and saline, and then returning the replenished blood...