Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Dick Hoyt (73) -- He's completed more than 1,000 different athletic events, including 68 marathons, 240 triathlons and six Ironmans, all while towing his 51-year-old son Rick, who has cerebral palsy, along for the ride.
iStock / gbh007
National Portrait Gallery, London
iStock / mashabuba
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