The real scientific insights from Bryan Johnson's immortality quest

Tech millionaire turned longevity pioneer Bryan Johnson devotes more than 6 hours a day to trialling different methods to turn back the clock. Can the rest of us learn anything from his radical approach? Bryan Johnson is finishing his 6.5-hour morning routine when I sign on to Zoom for my allotted 15-minute call with him (a constraint of what a member of his team describes as his "crazy" schedule). The tech millionaire turned longevity pioneer is standing in front of a cement wall in his California home, the coldness of which is relieved by green bursts of tropical houseplants. Wearing a helmet-like headset, a few wires trailing out and down past the screen, together with a black T-shirt bearing the words "Don't Die", the effect is somewhere between a luxury Balinese villa and a VR store designed by Apple.