I have heard many different things so I wanted to ask everybody here, at what age is a horse done growing? My APHA colt is 2yrs and 7 months and he already sticks at 15.3h. I know that every horse is different but approximately how much more growing will he do? Just curious, knew when I bought him last year that he was going to be a big boy but he is bigger than I thought he would be. His size doesn't matter, I'll love the big goofy lug no matter how big he gets.