I have two stepchildren I've been raising since they were babies. The oldest is 8, but is much more reserved than his 5 year old sister. My 5 year old SD went on all the rides at
Disneyland, including Splash Mountain, Space Mountain, and Big Thunder Mountain with no problems when she was 3. She met all the height requirements (she's only in Kindergarten but already the size of a 2nd grader) and was fine. My SS went on all the rides, including the coaster at California Adventure and the one that drops you hundreds of feet...he was 6 at the time. I'm uncertain how my SS may react to M:S because he does tend to get a little carsick. My SD would probably be fine and laugh.
On the subject of the child who died: I will not be surprised if they discover he had an underlying heart condition. It sounds a LOT like Long QT syndrome, which is where the person's heart has a longer than average electrical conduction. Everything works fine UNLESS that person is startled, surprised, or scared during a certain point in the heart's conduction. What results is the heart stopping and the person going into cardiac arrest. It's almost always fatal, although it CAN be prevented by simply putting them on medication. My good friend has this and I've known 2 middle school children who died. We were taught about it in nursing school and it's not something they test for upon birth unless it's requested. It's also hereditary and chances are very high someone else in the family would have it.
If I were the family, I would be getting EKG's done to see if anyone else has this. There was a mom on television a while back who was playing with her toddler son at home. She ran around one way while he went the other, then she jumped out at him and said, "Boo". His heart stopped and he died before paramedics could get him to the hospital. He had Long QT syndrome and mom never knew. They tested the rest of the family and discovered that mom had it in her family. Sorry to make this so lengthy, but I wanted people to be aware of it since it's something that can be treated if diagnosed but if not found, is almost always fatal. I feel for this little boy's family because I know I would be carrying around HUGE amounts of guilt should something like this have happened to one my stepkids.
I don't think putting an age requirement on the ride is reasonable because as another poster mentioned, how are you going to prove that? Bring birth certificates with you? And considering over 8 million people have ridden the ride without being unharmed (seriously injured anyway), it seems to be a safe ride. Unfortunately, bad things happen. The person that was killed on Big Thunder Mountain at Disneyland a few years back died just a day after we had ridden the ride. It kind of scared me to think I had my kids on that ride, but I know there is a risk with anything in life.
Melanie
