U.S. residents are generally living longer these days, but more and more of them are developing chronic diseases, such as diabetes and heart disease, that will shorten their lives and boost medical costs. Some 133 million adults — almost half the adult population — now have a chronic health condition, according to the Centers for Disease Control and Prevention.

Such a staggering statistic might lead you to think illness and impairment are synonymous with aging. But growing old doesn't have to bring disability and disease. Here are eight tips from experts on how to stay healthier, stronger and happier in your golden years.