© Getty Images The two Olympic marathons held last August in Beijing were literally races for the ages. Kenya's Samuel Wanjiru, then 21, broke more than an Olympic record with his 2:06:32 win; he crushed long-held conventional
Tarnopolsky, director of the Neuromuscular and Neurometabolic Clinic at McMaster University in Canada. Tarnopolsky won an Ontario trail-running series three times in a row, at ages 41, 42, and 43. "Last year, I was running better times in some races than I did
