Given the size of Disney, including four separate theme parks and Downtown Disney, there are plenty of attractions and entertainment for all ages. You can learn more about all the different options on Disney's own website:
When you go to that site, use the filters on the left to sort the information.
One could say that overall Disney is geared toward kids and "kids at heart." But realistically, regardless of your age, you really have to go out of your way not to have fun there.