Your bone density works like a bank account. You make deposits in your 20s and 30s. You start making withdrawals around 40. The question is whether you're keeping up. Peak bone mass is reached by age 30. After 40, the body naturally begins drawing on what was built, about 0.5 to 1% per year. Women experience a faster shift in the years following menopause. Men follow the same pattern, just more gradually. The earlier you start supporting bone density, the more you have to work with later.
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