Biohacker, 45, who spends $2m a year trying to de-age himself gets injected with the blood of teenage son

A man who spends millions of dollars every year trying to reverse his biological age has taken a bizarre next step.

For some time now, Bryan Johnson has been on a quest to turn back the hands of time:

Following a strict diet and workout regime, the tech mogul has managed to shave off some of the years he's accumulated.

But now, the 45-year-old has revealed that in an effort to find the secret to eternal youth, he's been injected with his teenage son's blood.

Having undergone blood transfusions with a stranger in the past, Bryan has now done the same with his 17-year-old son, Talmage, and dad Richard, 70.

The three generations of the Johnson family travelled to a clinic in Dallas, where Richard and Talmage had a litre of their blood removed and converted into a batch of plasma, and another of red and white blood cells, and platelets.

Bryan Johnson/YouTube

Talmage's plasma was then injected into his father in the hope that it will repair any cellular damage and rejuvenate his blood.

Pointing to a container filled with his plasma, Bryan said: “Hey, look at that. This is how you can tell if I’m a fraud or not. The colour is nice. It’s pristine."

Claims that plasma from younger bodies can improve the health of older generations have been around for some time.

Studies on the matter have been carried out on mice in the past, though experts say the results are inconclusive and suggest trying it on humans is fairly reckless.

Charles Brenner, a biochemist at City of Hope National Medical Center in Los Angeles, said: “We have not learned enough to suggest this is a viable human treatment for anything.

“To me, it’s gross, evidence-free and relatively dangerous.”

TikTok/@_bryan_johnson_

However, Bryan's team believe it could help him achieve his goal of reversing his biological age.

And the billionaire says they haven't decided to do it on a whim.

"We start from evidence first,” he said. “We do nothing based on feeling.”

Speaking previously about his extreme health regime, which he has called 'Project Blueprint', Bryan revealed that he has seen some marked improvements in different parts of his body.

"My left ear is 64, my fitness tests say I'm 18, my heart is 37, my diaphragm strength is 18," he told the BBC, admitting that some parts of his body are older than others.

"I playfully say I'm trying to become like, an 18-year-old. My son is 17, so I always tease him and say, 'When I grow younger, I wanna be like you'."

Bryan has also promised to publish the results of his blood transfusion in the coming months.