Steve Horvath is an aging expert and researcher at the University of California. He proposed in 2011 a method to measure biological age through chemical markers in DNA that modify genetic expression.

The scientist now works for Altos Labs, a company financed by millionaires like Jeff Bezos. “I am no longer interested in space travel. I wouldn't leave, I like the Earth, but I still want to prolong our useful life,” he says in a video call conversation with EL PAÍS.