Source: http://www.macleans.ca/society/health/ol...

Indeed, countless experts told Webb that 70 per cent of the effects of aging are preventable. “By moving faster, we slow aging,” she writes, citing facts about DHEA, a naturally produced steroid known to protect women from muscle loss and increased risk of dementia, even after estrogen production stops. Exercise can pull off the same benefits as hormone replacement. “Stress the body,” she says, “and I mean push the pace; pump up the weights, pour out the sweat—and, at any age, the body gets the signal that you want to live, you need to live.”