Bryan Johnson is a 45-year-old man - but he's managed to obtain the lungs of an 18-year-old youngster.
According to tests, the biotech entrepreneur has the heart of a 37-year-old, the skin of a 28-year-old, and the lung capacity and fitness of a late teenager.
But that isn't enough, as his aim is to eventually have all of his organs functioning as if they belonged to an 18-year-old, including his brain, liver, kidneys, teeth, skin, hair, penis and rectum.
However, it comes at a hefty cost, specifically, a staggering $2 million each year, but there are signs he might actually be able to unlock the secret to age reversal.
He's not alone, as LeBron James, 38, is said to spend $1.5 million a year on his body to stay young, while Novak Djokovic is known to sit in in a pressurized egg to enrich his blood with oxygen.
While there are lots of people desperately trying to keep old age at bay, they are all doing it on a tiny scale compared to Johnson.
The middle-age software developer, who was born and raised in Utah, launched three start ups between 1999 and 2003.
His mobile phone-selling business helped him pay his way through university, while he also launched a video call and real estate business.
But he made his fortune through Braintree, a payment solutions company that was acquired by PayPal, then part of eBay, for a whopping $800 million in cash.
In 2016, Johnson founded Kernel, a startup that manufactures $50,000-apiece helmets that measure brain signals and the impact of meditation on chronic pain.
Now he is using his enormous wealth in his pursuit for eternal youth - hiring a team of 30 doctors and regenerative health experts to oversee his regime.
Led by 29-year-old regenerative medicine physician Oliver Zolman, they are putting Johnson through an intense experimental program called Project Blueprint.
It costs several million dollars just to get the project off the ground, which includes buying a medical suite at Johnson's Californian home.
"What I do may sound extreme, but I’m trying to prove that self-harm and decay are not inevitable," Johnson told Bloomberg News.
Zolman and Johnson obsessively read the scientific literature on aging and longevity, and is using the tech mogul as a guinea pig for the most promising treatments.
So what does a normal day look like for Johnson?
He wakes up at 5am, starting the day by a dose of supplements and medicines such as lycopene, zinc, and metformin, as well as a microdose of lithium for his brain.
The biotech CEO works out for an hour every day, as well as high-intensity exercise three times a week.
To quench his thirst he drinks green juice laced with creatine and collagen peptides, while also rinsing his teeth with tea-tree oil and antioxidant gel.
He must abide by a strict vegan diet, which amounts to 1,977 calories per day.
Before going to bed, which happens at the same time every day, he wears glasses that block blue light for two hours.
The strangest aspect of it all is that he is hooked up to a machine while he sleeps to measure the number of erections he gets while sleeping - and it's at the level of a teenager.
He also takes daily measurements of his weight, body mass index, body fat, blood glucose levels and heart-rate variations using ultrasounds, MRIs, colonoscopies and blood tests.
"I treat athletes and Hollywood celebrities, and no one is pushing the envelope as much as Bryan," said Jeff Toll, an internist who is part of Johnson's team.
Johnson wants to encourage others to follow suit by turning his relentless pursuit of youthfulness into a competition, starting a Rejuvenation Olympics website with a leaderboard ranking people all over the world.
Do you have a story to share? Email webfeatures@trinitymirror.com
