It would depend on the child. My older son, who is tall & met most height requirements at 3, is a chicken. He didn't get on SM until he was 10. My younger son, who is a daredevil, is short, and couldn't get on until he was 6. FWIW, if he had been tall enough at 3, I would have taken him on SM. If your child enjoys thrill rides and meets the height requirements, go for it! You could try Goofy's Barnstormer first to see if he likes roller coaster type rides.