Hard to say: By genetic input you would expect him to reach the average of both parents (5'7") plus 2.5 inches. He is presently on the average growth curve for age and could reach that or taller. However you say he hasn't grown much so he may be slowing. An x-ray of his wrist/hand could estimate bone maturity & potential for more growth. If normal he should make 5'9.5"
Answered 12/4/2017
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