Which is correct about why a person's metabolic rate naturally declines with age?

Question

Quizplus · Accepted Answer

As people age, they tend to engage in less daily physical activity, which results in a decline in their metabolic rate. This decline in activity could be due to a variety of reasons, such as a decrease in physical ability or a change in lifestyle. While bone mass does decrease with age, it is not the primary reason for a decline in metabolic rate. Older people may eat less food, but this is not the main cause of a lower metabolic rate. Furthermore, there is a natural loss of muscle mass with age, not a gain, which could also contribute to a slower metabolic rate.

Which Is Correct About Why a Person's Metabolic Rate Naturally