I wouldn't undermine the taste of children so glibly.

I don't recall any adults when I was a kid watching Star Wars every time it came on the tv but certainly kids my age never missed a showing; the reason so many adults now like the films is simply because they would have seen those movies at an age when such things would have affected them profoundly - ie when they were kids. Same as having stories like Hansel And Gretel read to you as a child, it lives with you forever simply because it's such a good story. Would you think to pick up a book of fairy tales as an adult, though, if you hadn't been exposed to them when you were younger? I dare say not.

Anyway, I'm forty and I have yet to grow old of fart gags.