Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Fauja Singh (102) -- He was in his 80s when he took up marathoning because he felt "more dead than alive" after his wife died. At the age of 102, he's still going strong. In January 2013, he took part in the Mumbai Marathon.
Lucy Richardson/ Reuters
iStock / gbh007
National Portrait Gallery, London
iStock / mashabuba
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