Can someone tell me roughly what age boys feet stop growing. My son wants a pair of air force trainers for his birthday. He will be 15 and currently a size 8 and has been for about a year. Could his feet have stopped growing or do they just grow slowly at this age? He tried on an 8 and they fit fine but a 9 were massive but don't want to have to fork out for another pair in 6 months time if his feet have grown!