Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
BKS Iyengar (94) -- The founder of Iyengar yoga, he's considered one of the foremost yoga teachers in the world and can still bend his body any which way he wants to.
Bill Ebbesen/Wikimedia Commons
Thomas Reiner/CNN iReport
Warner Bros. Television
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