Keeping busy and having a purpose in life.Older adultswho have a purpose live longer than aimless ones. Busy people may adopt a healthier lifestyle to fulfill such ambitions. The younger you are when you discover your purpose the better.The secret of long life could be as simple as having something to do, psychologists claim. They found adults who spoke of having a purpose in life were more likely to still be aroundThey found adults who spoke of having a purpose in life were more likely to still be around at the end of a 14 year study than those who considered themselves 'aimless.'For those about to retire, for instance, it suggests they will live longer if they filled their days with activity rather than contemplate doing nothing after giving up work.