What is the average wing span of a 13 year old boy?

I'm not exactly sure...I have a arm span of 5 foot 8, and that's a little long for 13 year old 8th grader. I'm 5' 6'', and the average ratio from height to arm length should be about the same, give or take a few centimeters. So I have 2 inch longer arms than average. If you are 5' 6" than your arms should be about 5' 6". Get the drift?