tech entrepreneur bryanjohnson is spending millions trying to turn back time on his body.efer to myself as a professional rejuvenation athlete. it's a new sport i want to create. i'm not a bio—hacker, i'm not a health enthusiast, i am a professional rejuvenation athlete. i love it. working with a team of 30 scientists, his daily life is dictated by an extreme regime of fitness, diet, tablets, tracking and treatments. i'm chronologically 45 years old. biologically, i am a few hundred ages. my left ear is 64. my fitness test say i'm 18. my heart is 37. my diaphragm strength is 18. and i playfully say i'm trying to become like an 18—year—old. my son is 17 and so, i always tease him and say, "when i grow younger, i want to be like you". where's he taking me? brilliant. wow! where to start in here? what's this? this is high frequency electromagnetic stimulation. we got this machine because we were trying to solve a problem. every night, i was getting up one time per night to go to the bathroom and when i do so — that's actually normal — but when i did so, it produced less quali