Maintenance of health in old age.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D005260:Female; D005853:Geriatrics; D006801:Humans; D007360:Intelligence; D008017:Life Expectancy; D008297:Male; D008593:Menopause; D001523:Mental Disorders / Q000209:etiology; D009747:Nutritional Physiological Phenomena; D010012:Osteogenesis; D010024:Osteoporosis / Q000209:etiology; D011159:Population Surveillance