Adulthood is a critical stage in human development characterized by significant physical, psychological, and social changes. In terms of physical development, early adulthood, which generally ranges from ages 20 to 40, is marked by the peak of physical health and strength. Individuals typically experience optimal cardiovascular efficiency, muscular strength, and reproductive capability during this period. Metabolic rate is high, and sensory abilities such as vision and hearing are generally sharp. However, gradual changes begin to occur, including a slow decrease in bone density and muscle mass, especially if physical activity is insufficient. Skin elasticity may decline, leading to the appearance of fine lines and wrinkles. For women, the late 30s may bring early perimenopausal changes, whereas men may experience a gradual reduction in testosterone levels, affecting muscle mass and energy levels. Middle adulthood, from around 40 to 65 years, brings more pronounced physical changes. Muscle strength and flexibility continue to decline, and the risk of chronic conditions such as hypertension, diabetes, and cardiovascular disease increases. Vision changes like presbyopia, or difficulty focusing on close objects, become common, and hearing loss may begin, particularly at higher frequencies. Metabolism slows down, making weight management more challenging. Women undergo menopause, resulting in the cessation of menstruation and a decline in estrogen levels, which can affect bone density and increase the risk of osteoporosis. Men experience andropause, a term used to describe age-related hormonal changes, leading to decreased vitality and libido. Despite these changes, middle adulthood is often a period of relative physical stability for those who maintain a healthy lifestyle. In late adulthood, generally considered to begin at 65 years and beyond, physical changes become more significant. There is a noticeable decrease in muscle mass and strength, often referred to as sarcopenia, and bone density continues to decline, increasing the risk of fractures. Cardiovascular efficiency diminishes, respiratory capacity decreases, and the immune system becomes less robust, making individuals more susceptible to illnesses. Sensory declines become more pronounced; vision problems such as