Young people aren't the only ones who should strive for physical fitness.
Older people can benefit, too.
Advanced age shouldn't be taken as an excuse to settle into a rocking chair and not move. The more active you are, the younger you'll feel. Moderate activity is enough to give you health benefits. Walking is good aerobic exercise that just about anyone can do. Get a good pair of shoes that keep your ankles stable and walk several times a week, for about 20 to 30 minutes.