David Sinclair, 53, says his biological age is a decade younger than his actual age. The longevity researcher swears by supplements, intermittent fasting, less stress, and exercise. Most of his habits ...

David Sinclair drinks hot water with lemon every morning.David Sinclair/Getty ...

We've seen drugs that may increase the human lifespan, and scientists have even said they've figured out how to slow down aging altogether. But, Harvard molecular biologist David Sinclair says he was ...