Adherence

Aerobic exercise (walking/jogging) is associated with lower fat mass in aging men, but does not prevent the age-related loss of fat-free mass.

If you rely on walking or jogging for your fitness, be aware that it will not stop you from losing muscle as you age. To maintain muscle mass, you must incorporate resistance training. Aerobic exercise is beneficial for reducing fat, but it is not a substitute for strength training in preserving fat-free mass.