Since most medical care is devoted to those over 65, geriatrics, the medical treatment of the elderly, is a highly important specialty. The specific problems of the elderly include physical inactivity and instability, which result from weakness and loss of energy. Weakness of the eyes and ears plays a role, and weakening of the immune system often leads to more disease. All these conditions can be made worse by mental problems, such as declining intellectual activity, declining memory, and depression, which may prevent the patient from taking action to improve his or her condition. But the effects of aging can be greatly relieved by proper care. And the greatest improvement often results when the patient is persuaded to become more physically, mentally, and socially active.