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Nir Barzilai, who studies 'SuperAgers,' was recently invited by the Vatican to give a talk on stem cells and aging. "Now it all makes sense," he joked about the invitation, which came before the Pope's resignation. But he doesn't have all the answers about aging well -- nor do any other geriatricians who study the 'oldest old.'
With the average human lifespan pushing 80, there are more octogenarians in the world than ever before -- but it's impossible to predict their health course at that age, say researchers.
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