Compact bone mineral density was determined by roentgen ray photodensitometry in the proximal radius of 292 normal men and 302 normal women in the 20 to 90 years age range. Between 20 and 49 years, the bone mineral density did not change significantly. The normal bone mineral density was found to be slightly higher in women than in men. After age 50, bone mineral density decreased proportionately more in women than in men.
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