UNTIL NOW, DE-AGEING HAS MOSTLY been the province of the wealthy. At the far extreme are people like tech billionaire Bryan Johnson, who is said to have received blood transfusions from his teenage son and spends millions each year following a rigorous lifestyle plan with the aim of slowing or even reversing his biological ageing.
Johnson, 46, has even created an online forum and leaderboard, the “Rejuvenation Olympics”,
