Forget the fountain of youth — the secret to staying young may lie in how you spend your free time. New research has identified a series of fun activities that appear to help slow how quickly the body ages, with effects similar to those linked to exercise . But don’t expect one afternoon to turn back the clock. The strongest effects were seen in people who did them regularly and mixed up their day-to-day routines. “These results demonstrate the health impact of the arts at a biological level,”