If they could turn back time: how tech billionaires are trying to reverse the ageing process

Jeff Bezos and Peter Thiel are pouring huge sums into startups aiming to keep us all young – or even cheat death. And the science isn’t as far-fetched as you might thinkIn the summer of 2019, months before the word “coronavirus” entered the daily discourse, Diljeet Gill was double-checking data from his latest experiment. He was investigating what happens when old human skin cells are “reprogrammed” – a process used in labs around the world to turn adult