Growth plates in wrists

My son is 14, 5'8" and 150 lbs...very muscular and V shaped.  He broke his thumb the other day and the ortho said his growths plates were closed in his wrist and he is done growing in height?  Can that really be true?  He is devastated and I am looking for a glimmer of hope or anything I can do for him.  I am 5'4" and his dad is 6'2".  He had 3 6'5" uncles.....anything I can do for him medically, diet, or exercise-wise to extend his growing time?

Thank you so much.

[Dakota102010]

Unfortunatley no, theres no growth medicines to increase these natural occurences, he's about the average height between mom and dad. He may grow a bit more, but around 14-16 you reach your maximum height, he may grow some more over the next 2 years, tell him not to worry, and just to keep up his regular exercise and healthy diet.