Genetic Theory Hayflick Limit Conductive Theories of Aging Sensory Changes in Hearing Sensorineural Hormonal Human Growth Hormone Immunity Theory Osteoporosis Fractures Free-radical Theory Conditions Activity Theory Delirium and Dementia Sociological Theory Disengagement Skin Hair Nair growth Dependency Theory Intergumentary Changes Hypokinesis Sarcopenia Sweat Cartilage Esophagus and Swallowing Stomach and Intestines Malnutrition Intervertebral Discs Physiology of Aging Gastrointestinal Tract Constipation Bone Density Posture Brain Geriatrics Nerve Conduction Brown Heart Reaction Time Blood Vessels Decrease in blood volume Cataract Decreased elasticity of veins Presbyopia Sensory Changes in Vision Decreased in cardiac output Increase in blood pressure Cardiopulmonary Changes Macular Degeneration Glaucoma Chest Wall stiffness Diabetic Retinopathy Increased in ventilatory work Decrease in sensitivity of taste and smell Increased in perceive exertion Increased in rest period Taste and Smell Decreased in cough mechanism Benign Paroxysmal Positional Vertigo Increase in reliance of taste enhancers Decrease in home safety Decreased in gag reflex Meniere's Disease Loss of appetite Decreased sensitivity to touch Vestibular System Somatosensory Decreased in proprioception Decrease in Joint reception