Age The likelihood of exercising was highest for people between the ages of 18 and 44. Sixty-one point seven percent of adults aged 18 to 44 indicated that they exercised at least three times each week for at least a half an hour each time. This compares to a percentage of 53.5 percent for those aged 45 to 64 and a percentage of 46.7 percent for those aged 65 and beyond.