So hear me out, most men don't really mature humor-wise(or horny-wise) after the age of 12. We just learn how to interact better. Now, Ben may be in his late 20s or early 30s and married. He may also be taking college classes but he still has his childhood humor. Thus, your statement is 100% possible without creating a paradox.
@Paul_Tromba I prefer the idea that Ben is three dudes (a twelve-year-old, a college kid, and married guy) in a very large trench coat that browse the forums together and then argue who gets to post this time.