An article from Medical News Today described a recent study which showed that resistance training not only builds muscle strength in individuals 65 and older, but also increases the function of the mitochondria in muscle cells. Mitochondria are the cellular organelles that provide energy (ATP) to the cells. What this means is that this type of exercise seemed to reverse the signs of aging in the muscle cells.
Other studies have found that exercise by older adults improves both their physical and mental condition (from Medical News Today). For example, structured exercise may help older adults to retain their mobility.
Libraries can help older adults by offering nutrition and exercise programming. The Libraries for the Future organization has created the "Fit for Life" program. This organization administer grants to libaries that want to provide health and wellness programs. Another good example of public library older adult nutrition programs is the Alameda Public Libary System program.