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.
Courtesy of NOAA/Institute for Exploration/University of Rhode Island
David Shankbone/Wikimedia Commons
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