Describe the factors that keep the metabolic rate at a high level and evaluate why this will someone age healthfully

Metabolic rate is affected by factors such as level of exercise, amount of water intake, quality of diet and amount of rest given to the body.
If all these factors are maintained at a healthy amount, a person is far more likely to age in a healthful manner than they would be if they did not maintain these factors at a healthy level.
Therefore, maintaining metabolic rate a high level will help help someone age healthfully. 

Describe the factors that keep the metabolic rate at a high level and evaluate why this will help someone age healthfully
Cellular metabolic rate is determined by how active the cell is in making proteins, dividing, and producing energy for those processes. Related to aging, having a balanced diet would help prevent the metabolic rate from slowing because the cells will have all the materials they need to grow and repair.

The factors that keep the metabolic rate at a high level are: regular exercise, balanced diet, rich in proteins helps in keeping our metabolic rate high All this is helpful for someone to age healthfully as regular exercise and balanced diet keeps all our organs active.