At 101 years old, Buster Martin became the world's oldest marathon runner. The former army physical training officer took 10 hours to finish the 26.2-mile(42 km) London Marathon in April 2008. A month later, over 2,000 miles away on the highest peak in the world, Min Bahadur Sherchan climbed Mt. Everest, just 25 days shy of his 77th birthday an most to stay at home and enjoy their retirement these two men accompt d physical feats that people much younger than them do not even dream about. Have they discovered the eusive fountain of youth? 12 As life expectancy increases, stories like