Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Sister Madonna Buder (83) -- Known as the "Iron Nun," she holds the record for being the oldest person to finish an Ironman triathlon. She's participated in at least 35 Ironmans and hundreds of other races.
German Federal Archive/Wikimedia Commons
Christian Hartmann, Mario Anzuoni/Reuters
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