Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Yuichiro Miura (80) -- This Japanese mountain climber, who's had four heart surgeries, became the oldest person to scale Mount Everest earlier in 2013. He first accomplished the feat in 2003 and repeated it five years later too.
German Federal Archive/Wikimedia Commons
Christian Hartmann, Mario Anzuoni/Reuters
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