What Should I Weigh Given My Height and Age?

The optimal weight of a person is determined by a number of variables, including:

Height and frame size, gender
percentage of muscle to fat
The typical weight, height, and waist measurement for American individuals aged 20 and older are as follows, according to the Centers for Disease Control (CDC):

Women
Weight on average: 170.5 pounds
Average waist size: 38.7 inches Average height: 5 feet, 3.6 inches tall
Men
Weight in general: 197.8 pounds
5 feet, 9 inches tall on average
40.3 inches is the average waist measurement.
Despite being averages, these weights are not necessarily the best for health. The CDC also discovered that the average American adult had a body mass index (BMI) of 29.6 for women and 29.1 for men, both of which are considered overweight. The BMI is a measurement based on height and weight that can provide an indication of total body fat.

How Does BMI Work in Choosing Ideal Weight?
The BMI (body mass index) is a metric that doctors use to assess a patient’s level of obesity. Typical weight ranges are determined using BMI. Adult BMI does not depend on age.

BMI is computed the same way as it is for adults when used on children, but the ranges are then compared to percentiles for kids of the same age and sex.

The square of the height and weight are used to determine BMI:

Height (in meters) squared times body weight (in kilograms) equals the BMI.

If your BMI is under 18.5, you are underweight.
BMI 18.5 to less than 24.9: A healthy weight range of 25 to under 29.9: BMI 30 to under 34 overweight.9: BMI 35 to under 39 and Class I Obesity.9. Class II Obesity with a BMI of 40 or higher: Third-class obesity