National Geographic writer and explorer Dan Buettner who studies the world's "Blue Zones" -- communities whose elders live longer than anyone else on the planet -- distills their secrets into a single plan for health and long life. Cambridge researcher Aubrey de Grey argues that aging is merely a disease — and a curable one at that. Biochemist Cynthia Kenyon has found a genetic mutation that can more than double the lifespan of a tiny worm, which points to how we might one day significantly extend human life. Medical ethicist Harvey Fineberg questions whether we're ready for "neo-evolution?" Author Isabel Allende, now in her 70's, shares how to live passionately -- no matter your age.
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