Actually, even that isn't an adequate delimiter. The problem is really how to deal with physical problems, like arthritis or lack of muscle strength and endurance, problems normally associated with aging, but which can appear at any age. So, if the shoe fits, wear it, as they say. We will only address the exercise aspect of weight management. It is widely accepted that permanent weight loss from diet alone is pretty futile.
Exercise is now an integral part of any permanent weight loss program.
And take notice that an exercised body is a more attractive and functional body. A result of this is a lowering of the heart rate. Lowering of the heart rate and blood pressure reduces risk of heart disease. It is, in essence, the amount of oxygen that we can utilize during vigorous exercise. Exercise produces higher energy by raising VO2max, which increases your endurance.