Why older people need less energy than younger people?

Question

Why older people need less energy than younger people?

Answer 1

Older people don't (necessarily) NEED less energy than young people...they HAVE less energy than younger people because their bodies are aging and wearing out ~

Answer 2

Young people need more energy because they grow. The bodily growth (cell formation) takes place till the age of about 25 to 30. There is no growth and the body remains constant (stagnant) from 25-30 till about 50 years of age. There is no cell formation afterwards. May be it is because of this, the aged people require less energy and the younger people require more energy.

Answer 3

the metabolic rate like the speed slows down as we age. we also require less sleep. the demand is directly proportional to the expenditure.

Answer 4

i think its because they use less energy than us because they dont run around as much as us