It might be a surprise for you, but e90post used to be what f30post is now. I've been on boards for long enough to witness that.
Over the years, I've seen forum members post pics of their own poop. A couple of "intelligent" individuals keep bumpin the "I can't believe you've done this" thread for like the past 3 years. And some other people can only talk in a "DIIIIFFFFUUUZZZZOOORRRRR NAAAAAAOOO" sort of fashion.
So maturity level varies. As the cars get older, their owners get younger.