I know they dont stop growing until they are at least 8/ 9yo hes 7yo now I'm just curious to find out if he may get a little bigger hes 13hh now to me he doesnt seem bum high at all so I'm thinking hes stopped and will just fill out a bit more...im going to start riding him after recently loosing my other horse I'm not fussed if he wont grow any more I love him regardless I'm just curious