No Reason to Slow Down at Fifty

From Globe and Mail

If it's acute injuries, not wear and tear, that lead to arthritis, you may expect running to be in the clear – and indeed that's what a series of recent studies have concluded. In a Stanford University study published last year in the American Journal of Preventive Medicine that followed subjects for 18 years starting in 1984, researchers found that 20 per cent of the runners developed knee arthritis, compared with 32 per cent of non-runners.