Was in Disney over the last two weeks and I got the chance to bring my 3 year old on Star Tours. The minimum height for the ride is 40 inches. He was exactly 40 inches. We had to push his feet together, make him stand up straight, etc. but he just brushed the height bar (actually we had to go through that twice as they measure you at the start of the line and right before they assign you to a car..). He sat between my nephew and I, held our hands, and the only thing I heard him say was "Wow.". A very fun day for me. He had a lot more fun at the Magic Kingdom (Train rides, driving a go cart, the Dumbo ride, etc.), but it was well worth it, especially since the next time we'll likely get to go they will have revised the ride.