What should the waist size of a 13 year old boy be if he is 5 foot and half inches?

The average waist size for a 13 year old boy who is 5 feet 5 inches tall is 27-28 inches. However, this can vary depending on the individual's body type and build. Some boys may have a waist size that is smaller or larger than this average. If you are concerned about your son's waist size, it is best to consult with a doctor.