What is the average percent body fat for a 5' 7'' thirteen year old girl?

The ideal body fat percentage for females is 25% (the midrange "norm"), with a window for "acceptable/good" of 21% to 32.9%, for all ages 39 and under. Over 40, the range shifts upwards by a few percentage points, but not much. For males, the midrange is 15%, with a similar type window.