They can (and are) in their 30's, 40's, and even 50's, yet they behave like children on the web. What's more, the argument they always have of "Nintendo games hold their value so it's great Nintendo games aren't cheap."
I've read so many fanboys say that and they don't realize the games do eventually lose their value. Sure, some don't, but most do.
Buying games as an investment is a stupid idea, anyway.