Most men and women tend to gain weight as they get older because body metabolism slows with age. Although exercise helps because it builds muscle tissue -- which boosts metabolism, according to the Weight Watchers website -- you’ll probably need to lower your caloric intake if you want to continue to wear the same clothing size.
More Moves, More Calories
Weight maintenance is a matter of balancing activity level with caloric intake. The more active you are, the more calories you can eat. If you are a female couch potato over age 50, the National Institutes of Health Senior Health website advises you should eat no more than 1,600 calories a day. Kick your activity level up to moderately active, and your calories can go up to 1,800. Walk the equivalent of three or more miles a day at a brisk clip, and you might be able to take in 2,000 to 2,200 calories a day without gaining weight. Men -- who generally have bigger frames and more muscle mass -- are allowed 2,000 to 2,200 for low activity, 2,200 to 2,400 for moderate activity and 2,400 to 2,800 for the active lifestyle.