Can We Live Longer but Stay Younger?

Aging, like bankruptcy in Hemingway’s description, happens two ways, slowly and then all at once. The slow way is the familiar one: decades pass with little sense of internal change, middle age arrives with only a slight slowing down—a name lost, a lumbar ache, a sprinkling of white hairs and eye wrinkles. The fast way happens as a series of lurches: eyes occlude, hearing dwindles, a hand trembles where it hadn’t, a hip breaks—the usually hale and hearty doctor’s murmur in the yearly checkup, There are some signs here that concern me…

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