Years ago, when my soon to be 21 year old niece was little, there were a few rides with age requirements instead of height requirements. I know that Star Tours was one where you had to be 3, but no height requirement. We have pictures of her riding Star Tours that trip but she was too short for Splash and Big Thunder. I feel like Barnstormer may have been similar. Height requirement makes a lot more sense as I'm sure that plenty of people lied about their kids' ages.