Most (but not all) of the men in our family are well over 6'. DS1 was 6' 2" by age 16, and grew another inch at 18, so is now 6' 3". But younger brother DS2 is nearly 17 and has been 5' 11" for a couple of years now - his feet are size 10.5 UK and haven't grown since he was 13. He wants to be taller, especially as he is starting to be de-selected for the sport that he loves and otherwise excels at. His friends and team mates have shot past him in the last 2 years. We of course encourage him to love the height that he is, and tell him that late growth spurts are possible, like his brother. But, just for me, please tell me about your sons' late growth spurts - how late, and by how much?