Geriatrics is the branch of medicine focused on healthcare for the elderly. It aims to promote health and prevent/treat diseases and disabilities in older adults. Gerontology studies the process of aging. As people age, their skin, eyes, ears, kidneys, bones, nervous system, heart, lungs, and gastrointestinal system all undergo changes that can impact health. Common diseases in older adults include Alzheimer's, arthritis, cancer, cardiovascular disease, incontinence, and stroke. Geriatric physiotherapy addresses three main issues - deconditioning, cardiovascular diseases, and musculoskeletal problems. It focuses on reconditioning, exercise therapies, and addressing conditions like osteoporosis and osteoarthritis.