Imagine meeting your great-great-great-grandkids. Or going to law school in your 80s, learning to snowboard at 110, taking a gap decade instead of a gap year. Greg Bailey dreams of a world where everybody lives twice as long, and no one gets sick. His startup, Juvenescence, is developing a whole ecosystem of anti-aging medications to help you live longer, healthier. Which sounds great. But would this world of perky centenarians wreak havoc on our already strained resources? Would natural aging become taboo? Would dying? It's a technology that prompts us to ask some of the biggest questions of all.

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