To be honest, (not trying to hate on the advanced roleplays)
I've been looking for a roleplay and I realized that a majority was "mature, literate" and those are technically things I can't really reach.
And I agree as well, I wish that there were more RPing that welcomed younger audiences, I have some pretty bad stress when it comes to roleplaying, I'm a lazy person and I'm not used to it, I don't think it's really that necessary to summon all of the 900k details you could fit in a post, literally writing a few sentences stress me out when roleplaying but not in writing other things. But I think this happened because we lost quite a bit of the audience because the login page and they didn't know how to get into the log in page, which lost all of the smol innocent children.
I remember getting kicked out of a RP group, and even told "to leave the game" because they found out I was younger than they thought, although they weren't so harsh at all, they sort of lectured me and I still think about it every now and then and it ruins my mood.
I do agree with you, I don't detest anyone who does roleplay groups like this, or it's just that I get pretty nervous and scared when posting, some kids were on the game and asking to RP with some people, I got sad when they got turned back but I was sort of doing the same thing too, I wasn't saying "yes" because I wasn't exactly comfortable either though, but that was a pretty long time ago so I most likely changed my attitude over time.