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.
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
iStock / damircudic
Warner Bros. Television
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