When determining how much you should weigh for your age, there are a few factors to consider. Some include your height, sex, bone-density and muscle-to-fat ratio.
Some professionals recommend using the BMI (Body Mass Index) for determining your ideal weight. Yet others say that it's inaccurate since it doesn't factor in the muscle mass. They say that the waist-hip ratio is better.
One person's ideal body weight is going to differ from another person's. Don't compare yourself to a family member or a friend. If you do that, you may end up aiming too high if you're surrounded by obese or overweight people. On the other hand, if everyone around you is model material, you may aim too low.