Yes, your metabolism does slow down as you grow older, but not as significantly or as early as commonly believed. According to a study, metabolism peaks around age 1, when infants burn calories **50% faster** than adults. After this peak, metabolism gradually declines by about **3% per year** until reaching the 20s, where it levels off and remains **stable until around age 60**. Only then does it start to decline again, at a rate of less than **1% per year**[4][6]. 

Factors like loss of muscle mass and decreased physical activity contribute to this decline, but research indicates that the changes in metabolism are more complex than simply aging. For instance, the study noted that **metabolic rates are stable from ages 20 to 60**, and lifestyle factors might play a more significant role in weight changes during midlife than a slowing metabolism itself[5][6].

Surprising findings about metabolism and age

Does your metabolism slowdown as you grow older?

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