More Tomorrows

There is still so much life ahead of you. The question is whether your body will be strong enough to carry you into it.

Five years ago, an unexpected diagnosis forced entrepreneur and father of five Mark Seremet to confront that question. He stopped treating his health as something he could deal with later and immersed himself in the science of aging. Working with physicians, he rebuilt the way he ate, trained, slept, and lived.

Today, at 61, Mark has …