Staying physically, mentally, and socially active may help reduce the risk of depression in older age.
Cassano P, Fava M. Mood disorders: major depressive disorder and dysthymic disorder. In: Stern TA, Rosenbaum JF, Fava M, Biederman J, Rauch SL, eds. Massachusetts General Hospital Comprehensive Clinical Psychiatry. 1st ed. Philadelphia, Pa: Mosby Elsevier;2008:chap 29.
Unutzer J. Clinical practice: late-life depression. N Engl J Med. 2007;357:2269-2276.