As said above it depends on your child. When my DS's were 4 they had a Disney Halloween tape with scenes from the haunted mansion in it and were looking forward to the ride. They did not like the dark at that time and got so scared in the stretching room that they would not look at anything on the ride, they kept hiding into me and DH. After that they would not go on anything that was even remotely dark. We went back to WDW when they were 6 and they were fine on the ride, and rode it a few times. I have heard from a lot of people that the stretching room is where their kids got scared, but then there are those kids who are OK with it all.