I took my two cousins, at the time 7 and 10, to see both Aladdin and Matilda. Aladdin was first and they were pretty bored. I personally loved it, but they both fell asleep after Friend Like Me. I hadn't seen the show yet, so my ticket was worth it, but definitely was not worth the $200 I paid for them. A pretty expensive nap for them.
We saw Matilda the next day and they were pretty hesitant to go, but they were enthralled the entire time. We sat on house right in the orchestra and they were thrilled when the cast members walked past us in the aisles. Even though the title character is a girl, this show is anything but girly. Revolting Children was a highlight. The accents have now been Americanized- still British accents, but they pronounce the letter "r", and I, and the various groups I have seen the show with, have never had a problem.
I love this show and have now seen it three different times on Broadway, from the orchestra, mezzanine, and rear balcony. I suggest orchestra out of all three, but the front mezzanine isn't bad either. I haven't heard the best things about the tour, so taking them to see it on Broadway might be the best experience they'll have with it.