Lifespan: The Revolutionary Science of Why We Age—and Why We Don't Have To

by David A. Sinclair

Consider Tom Cruise. As the Top Gun actor entered his late 50s, with bulging muscles and a straight line of dark hair sprouting from a minimally wrinkled forehead, he was still at work. Not just acting, but doing the sort of acting that has long been the purview of much younger actors. He was still doing many of his own dangerous stunts, too: riding motorcycles at high speed through alleys, being strapped to the outside of a plane as it takes off, hanging off the top of the world’s tallest building, skydiving from the upper reaches of the atmosphere. How easily do the words “Fifty is the new thirty” slide from our lips these days? We forget what we used to expect life past 50 to look like, not hundreds of years in the past but just a few decades ago.

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