Hi, Lori! While I have seen children of all ages at
Fantasmic, it is a "dark" 25-minute show with many of the Disney Villains, loud noises, and some scary music. My daughter who is 9 loves the show, but I recently took my niece who is 4, and she was quite frightened by it. She's a pretty tough little gal, but this was a bit too intense for her.
You know your children best, so you will have to decide what will be enjoyable for them. However, it is my opinion you wait until they are a bit older. I am sure there are many parents who will say their little ones loved this show, so you'll have to be the judge of this one!
If you decide to see the show, plan to be in line 30-45 minutes prior to showtime to get a seat.