50 years old 120 pounds is normal, need to be based on height, weight, BMI [body mass index = weight (kg) รท height (m^2)] together to decide. 50 years old normal adult BMI range is usually in 18.5-24kg/m^2, depending on the height, can be specifically divided into wasting, normal, overweight, obese, etc. 1, normal: the normal value of BMI is 18.5- 24kg/m^2, then the height of the 50-year-old adults in 158-180cm is normal; 2, wasting: BMI < 18.5kg/m^2 for wasting, at this time 120 pounds of people’s height is 180cm. to 180cm as the boundary, below this height, then 50 years old 120 pounds is not normal phenomenon; 3, overweight: BMI24-28.1kg/m^ 2 for overweight, if 50 years old 120 pounds of adults, height in 146-158cm is considered overweight, is an abnormal phenomenon; 4, obese: BMI > 28.1kg/m^2 for obese, if 50 years old 120 pounds of adults <146cm, at this time belongs to the abnormal situation of obesity. In addition, BMI is not the only criterion for determining obesity, but also needs to be combined with gender, fat rate, body composition analysis and other comprehensive judgment, and BMI is not suitable for minors, pregnant women, lactating women and athletes and other people for weight analysis.