The age limit is there because most children before three still have the lanugo or "baby hair." This is similar to the hair on your body. Every style has some teasing in it which, if done on this young "hair", WILL NOT comb out. You'll just have to cut it out of the girls hair.
True, if you say she's three, they're not going to call you on it, but if she still has that hair or can't sit still and doesn't enjoy it because she freaks out, that's what you'll have to factor in.
It really all depends on the child, really. Just use your best judgement on her mood/maturity. If she goes in for the appointment and just doesn't want to have anything to do with it, you can always cancel the appointment.
If you plan to go back within two years I would wait. My favorite picture in the whole world of my oldest was taken when she was 4 at the BBB when they turned her toward the mirror for the reveal. She was so surprised and so happy. I know she wouldn't have had the same reaction at 2 1/2.
Monica
I understand that, but some kids still have some at that age in their hair and that is a main Disney reason for the age limit.
"Lanugo grows on fetuses as a normal part of gestation, but is usually shed and replaced by vellus hair at about 33 to 36 weeks of gestational age." -Wiki
That quote is for 36 weekold fetus, not a 36 month old child? I don't understand your point?
I saw a very little girl walking around MK with her super short hair done, and princess dress and a BB sash who looked no where near as old as 3! (one of the most adorable things i've seen actually)
Either her parents broke the rules, or she's the smallest 3-year-old I've ever seen. haha.