Betting on Youth: A Tech Entrepreneur's Strategy.

Tech entrepreneur Bryan Johnson is spending millions a year trying to reduce his biological age, how old his body seems, rather than his actual chronological age, which is 45. Age is the highest risk factor for disease, so if ageing as a whole could be delayed, then so could the risk of onset of these conditions. A new industry is emerging, promising a longevity revolution with techniques they say lead to healthier, longer lives. The big question is what does a healthy lifestyle mean?