The number of calories your body uses to carry out these basic functions is known as your basal metabolic rate — what you might call metabolism. Several factors determine your individual basal metabolic rate:

Your body size and composition. The bodies of people who are larger or have more muscle burn more calories, even at rest.

Your sex. Men usually have less body fat and more muscle than do women of the same age and weight, burning more calories.

Your age. As you get older, the amount of muscle tends to decrease and fat accounts for more of your weight, slowing down calorie burning.

via Metabolism and weight loss: How you burn calories – MayoClinic.com.

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