I'm nearly 20, and still like Disney and Pixar movies, especially the Cars movies.
I also have a big stuffed animal collection and a collection of die cast cars.
I also like going on Youtube and watching cartoons I liked as a kid - The New Adventures of Winnie the Pooh, DragonTales, Arthur...
I'm a huge animation buff. I also watch My Little Pony: Friendship is Magic whenever a new episode is released. And I've also been known to watch classic cartoons, 'toons from the 80s, Hanna - Barbera...wish I could get Boomerang in my dorm room for this very purpose.
You know what's interesting? When kids are in grades K - 2 or so, they don't see anything wrong with carrying around anything with licensed characters on it - like Pooh or the Disney Princesses....then, once they go thru grades 3 - middle school, they wouldn't be caught dead with something with Disney characters or Dora or whatever on it - unless it's a character like Hulk, Spiderman, or Optimus Prime, perhaps. But when I got to high school, it turned out that the students there LOVED anything with their favorite characters on them - I saw notebooks, bacpacks, folders, what have you covered with Elmo, Big Bird, Spongebob, Disney Characters/Princesses, My Little Pony, Care Bears, Clifford, Power Rangers, Barney, Pokemon, Disney Fairies, etc...in my junior year, I even saw a girl with a Dora sippy cup!
(but she only kept it on the first day of school). It was a great atmosphere to be in - I even got compliments on my Cars folders/notebooks.
I just found it interesting how the trends seemed to change like that...maybe in high school, since the next four years are kind of childhood's last hurrah before college/graduation, you try to cram in as much innocence and whimsy as possible. Of course, it may not be that way in all cases...I'm sure other have noticed very different trends.
Altho, one morning when I was about to leave my dorm for classes, I saw some residents gathered around someone's laptop watching the "Clock Stretch" segment from The Big Comfy Couch on Youtube. One of them commented that "once you get to college, it's like you go thru your second childhood." I think that's about right... 
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I wish Sterling Holloway narrated my life.
"IT'S NOT FAIR!" "Life isn't fair, Calvin." "I know, but why isn't it ever unfair in MY favor?" ~ from Calvin and Hobbes