Age affects nutritional needs due to changes in metabolism, body composition, and overall health. As individuals age, their metabolic rate generally slows down, which may reduce overall caloric needs. Additionally, older adults often require increased intakes of certain nutrients, such as calcium and vitamin D, to support bone health, as well as protein to maintain muscle mass. Hydration needs may also increase due to a reduced sense of thirst with age. Understanding these changing nutritional requirements is essential for promoting healthy aging and maintaining optimal health.