title: Understanding aging: the physiology of growing older.
mesh_terms: D000368:Aged; D000375:Aging; D001066:Appetite; D001842:Bone and Bones / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D006309:Hearing; D006801:Humans; D008875:Middle Aged; D009262:Nails / Q000502:physiology; D012879:Skin Physiological Phenomena; D014566:Urogenital System / Q000502:physiology; D014785:Vision, Ocular