Main Answer: The caloric needs of a 75 year old person will generally be lower than when they were 30 years old due to various factors. Explanation1: Firstly, as we age, our metabolism naturally slows down which means that our bodies require fewer calories to function. This is because the body's composition changes, with a decrease in muscle mass and an increase in body fat. Muscle tissue burns more calories than fat tissue, so with less muscle, the body requires fewer calories. Explanation2: Additionally, a 75 year old person may also be less active than they were at 30 years old. This could be due to physical limitations, health conditions, or simply a change in lifestyle. With less physical activity, the body requires fewer calories to sustain itself. Overall, it is important for older adults to adjust their caloric intake to reflect their changing needs and to ensure that they are still getting the necessary nutrients to maintain their health.