Our 4 year old DS turns 5 late August. He is 47". On our recent trip trip he cried over Primeval Whirl. To him it looks like a "kiddie" ride with the all the spinning and colors everywhere, but the height requirement is taller than Expedition Everest. He couldn't figure out why he got to ride EE, but they wouldn't let him ride PW. I kind of agree with him. It seems like a little bit of poor planning. The DinoLand area looks like a childrens zone with the colors and characters (Chester & Hester) roaming around. You would think that everything in that area would be suitable for little ones.