There is no exact figure for the weight standard for people aged 70-75, which may be affected by factors such as height, gender, etc. There will be some differences in the weight standard for different heights and genders. Generally speaking, the standard formula for calculating weight is height (cm)-105 or height (cm)-100, where the former is the standard weight for men and the latter is the standard weight for women. However, this approach is not quite applicable to the elderly aged 70-75, because the body functions of this age group will gradually decline, the metabolic capacity will also decline, their own weight changes will be relatively large. In this regard, the BMI index can be used to determine whether the weight of people aged 70-75 is standard or not. BMI index = weight (kg)/height (m) squared. As long as the BMI is between 18.5 and 23.9, then it is relatively standard. For 70-75 year olds, in order to maintain a healthy weight, then it is necessary to strengthen the daily dietary care, control the diet, pay attention to the combination of meat and vegetables, and appropriate physical exercise, you can choose some gentle exercise, such as walking, tai chi and so on.