Anti-aging adresses how to prevent, slow, or reverse the effects of aging and help people live longer, healthier, happier lives. It includes scientific research and applications in genetic engineering, tissue engineering, and other medical advances, e.g., finding treatments and cures for Alzheimer’s disease. It includes anti-aging psychology, e.g., coping skills for resiliently handling change, stress, and aging. Life extension is the part of anti-aging focused on living as long as possible.