I found that I had a hard time explaining to people why I wasn't riding my guy, when he was a baby. My guy is a 4 1/2 year old, 19hh, 2,000 pound Percheron, who has only grown an inch since he was 3 years old. YAY! So he was a big baby!
I have been riding him for about 6 months now. I try to explain how important it is to let a horse grow, develop mentally and physically, and get muscles. How a big horse doesn't mean that he is mature, just big. People just see a huge horse and assume he is "strong."