The joint and skin deterioration theory of aging focuses on the age-related degeneration of joints and skin. With age, joint tissues, such as cartilage, ligaments, and synovial fluid, undergo structural and functional changes, leading to joint stiffness, pain, and reduced mobility. Similarly, the skin undergoes structural changes, such as collagen and elastin degradation, leading to wrinkles, sagging, and reduced elasticity. Various factors, including genetic predisposition, mechanical stress, inflammation, and oxidative damage, contribute to joint and skin deterioration.