Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Dean Karnazes (51) -- In 2006 he completed 50 marathons in 50 consecutive days, doing one marathon in each of the 50 states. His final marathon was the New York Marathon, which he completed in an impressive 3 hours and 30 seconds.
Pete Souza/White House Photo
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