There is no exact age control chart for normal values of bone density, which peaks between 20 and 24 years of age for men and between 30 and 34 years of age for women. It is important to make a judgment based on the T-value. Bone density examination is mainly through the T value to judge, T value is the difference between bone density and the peak bone density of normal people, is a relative expression, bone density T value of the normal range between ± 1, T value is less than minus 2.5 to consider the possible existence of osteoporosis. A T-value of less than -2.5 with more than one fracture or a T-value of less than -3.5 is diagnostic of severe osteoporosis. For osteoporosis, the focus is on prevention. It is recommended to drink more milk, appropriate supplement calcium tablets, do not drink carbonated beverages, and pay attention to the sun every day, the sun should be sunshine between 11:00 ~ 3:00 at noon, each time about 20 minutes or so. When measuring bone density, you can consult the endocrinology department of regular hospitals, and if you have abnormal bone density, you should follow the doctor’s instructions for treatment in a timely manner.