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At what age do you build bone density? Your guide to building and maintaining strong bones

According to the National Institutes of Health, up to 90% of a person's peak bone mass is achieved by age 20. So, at what age do you build bone density? The short answer is that the most critical period for bone development is from childhood through early adulthood, and you will reach your maximum bone density, or peak bone mass, sometime between your late 20s and early 30s.