Objective:To explore the effect of age on body composition in healthy Beijing women. Methods:We measured body composition with dual-energy X-ray（GE Lunar Prodigy） in 316 healthy Beijing females aged 20 to 74 years（5-7 women per age）.Parameters provided by the software were as following:total body bone mineral content（BMC）,lean mass（LM）,fat mass and fat mass percentage（FM%）.Local regions measured included arm,leg,trunk,android region and gynoid region.Body mass index（BMI）,fat mass index（FMI）,free fat mass index（FFMI） and A/G were calculated.Volunteers were assigned to 6 groups according to age by every ten years a group. Results:BMC peaked during the 4th decade,LM peaked during the 5th decade,with a decline of 18.1%and 5.2%respectively at age 74 years.Total body fat mass and FM%showed a general increase with aging throughout the studied age range.Total body fat mass increased from（16±5） kg at age 20-29 years to（24±6）kg at age 70-74 years,while FM%increased from 31.3%to 39.5%.All local region FM%increased with aging at different extents. Android region FM%showed the largest raise extent（32.2%）.BMI increased gradually from 21.1 kg/m2 at age 20-29 years to 26.1 kg/m2 at age 70-74 years.FMI changed more obviously than FFMI.A/G increased from 0.85 at age 20-29 years to 1.02 at age 70-74 years.Different menstrual status in women of 40-59 years had obvious effect on A/G and BMC（P0.05）. Conclusion:Aging has a great effect on body composition distribution in healthy Beijing women.
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