For Males: 16 - 17 years old between 67 - 70 inches tall should weigh around 130 - 150 lbs For Females: 16 - 17 years old around 64 inches tall should weigh around 115 – 120 lbs.
However, everyone is different. If you are concerned about your weight or your child's weight, please talk to a doctor. Another good guide is the Body Mass Index, but it is not a one-size-fits-all tool. What is more important is good cardiovascular health and positive self image.