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Zombie cells key to quest for vital old age

(UPDATE) In an unfinished part of his basement, 95-year-old Richard Soller zips around a makeshift track encircling boxes full of medals he's won for track and field and long-distance running.

Without a hint of breathlessness, he says: 'I can put in miles down here.' Steps away is an expensive leather recliner he bought when he retired from Procter & Gamble with visions of relaxing into old age. He proudly proclaims he's never used it; he's been too busy training for competitions, such as the National Senior Games.