I don't seem to have this problem. I go to children's movies all the time, and I see a variety of ages.
I work at a theatre too, so I get to see who's going where, and a lot of adults go to see children's movies, without children. For instance, there was my g/f and I, and 3 other adult couples in "Kicking and Screaming" when I went to see it. Of course, it was just us and them, and it was the late show... Maybe I just choose appropriate times to go where there will be less kids and more adults. It comes with disliking kids and doing everything in my power to avoid them, I guess.