Age significantly influences an individual's nutritional needs, as each life stage has different requirements. For children and adolescents, adequate calories and nutrients are crucial for growth and development. Adults may require a balanced intake to maintain health and support energy levels. As individuals age, their metabolic rate can decline, leading to a need for fewer calories but an increased emphasis on nutrient-dense foods to prevent deficiencies. Older adults often require additional vitamins and minerals, particularly calcium and vitamin D, to maintain bone health.