My youngest son turns 4 about 2 weeks before we go. And my other son will be almost 6. Are they too young to go? I know that technically they are not, but realistically, are they?
I did Lights, Camera, Magic tour with my family in June. We all enjoyed it, but my kids are 9 and 13, so they could appreciate some of the history.
I have to say that a 4 year old and a 6 year old would probably get bored, unless they are really interested in old movies. The guides do try to keep kids interested, but kids unfamiliar with the Oscars and movies more than 10 years old are unlikely to "get" Hollywood.
The Disney Studios might be appealing to kids who are very interested in how movies and TV shows are made, but there is no guarantee of getting access to the sound stage.
I don't want to scare you off if you really want to do the tour and think your kids would appreciate it, but if you're not sure, you're probably better off finding something more small-kid-friendly. (With kids that age, I would rent a car and go to Legoland, which would cost considerably less.)
That said, I don't think we had very young kids on our tour, so there might be more that the guides can do for them. I hope someone around here has done this tour with young kids, or had young kids in the group, and will post information about how it went.