Over time, studies have shown that metabolic rate (how fast we burn calories) starts to slow down by 2 to 3 percent each decade, beginning in our 20s. It becomes more noticeable between ages 40 and 60.
What age is your metabolism fastest?
Your metabolic rate peaks in your early 20s, according to Women's Health Magazine. At this age, you tend to have a higher muscle mass and have a fair amount of physical activity built into your day. As early as age 30, however, men and women begin noticing a dip in their ability to lose weight.
Does metabolism slow down at 25?
But in fact, even though your metabolism is slower at night when you are stationary than when you are active, your metabolism never stops working, even when you are sleeping. Calories consumed at night won't change your metabolism or count more than calories consumed during the day.