Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Willie Gault (52, left) -- A former NFL star, Gault set world records in his 50-to-54 age group in the 100- and 200-meter dashes in 2011, clocking in at 10.88 and 22.44, respectively.
Warner Bros. Image
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