Elon Musk speaks with Larry Fink at Davos about whether aging can be reversed. Musk says he has not spent much time on aging research but believes it is a very solvable problem, pointing to synchronized aging across the body's cells as evidence of a biological clock. He says it is highly likely that humans will find ways to extend life and maybe reverse aging, while cautioning that extreme longevity could lead to societal ossification. No specific investment or market trade is proposed.