Hi
Stephanie S. , Sigh!

apparently your question has been thoroughly answered by default, yes it is normal in aspie land to love cartoons, toys, childrens books, childrens movies, anything imaginative children would like, much longer and more than adults. But I think what you were really asking is do aspies grow older biologically and mentally slower than Nts, with some variation the answer is yes. There seem to be studies indicating this, or you can just look at my picture, living proof. It isn't all bad tho, we reap allot of benefits on the back end, we can have a much higher quality of life in the later years than NTs, there is some karma in being a auti. or aspie. . I'm not sure I would give up me if offered a magic pill, some of me is pretty great, I would like to think I'm more interesting than the average NT.
So look for that hidden greatness lurking somewhere inside of your girl, there is no telling how high she will fly later in life. And watching cartoons just shows good taste in my opinion.