[@UltikanaRe] If a 12 year old wants to spend their free time writing, then I'd bake them a cake in celebration.

As far as 18+ roleplays, [i]generally[/i] you should adhere to the rules just to keep things blue skies. Of course, nothing is ever that simple, like;

If you're a 17 year old, 5 days away from your birthday, have been roleplaying for years, and you find the perfect RP, but it's rapidly filling up and it's 18+, then honestly you should be fine.

To contrast, an immature 19 year old, completely new to RPing, should [i]probably[/i] steer clear of 18+ until they get a feel for how RPing in general works.

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You shouldn't ever [i]ignore[/i] rules like that, though. Even if only keep in mind how flexible they may be. Talk to the GM if things seem iffy and all that.

I'm ecstatic for every 12 year old that want to try out RPing and writing (and younger!). But even considering all that, they shouldn't be doing 18+ RP's, even if they're mature.

That's gross and also possibly pedophilia? Hebephillia? 

It's wrong to introduce those themes to someone who isn't fully mentally prepared to consider what they mean. Also there's like, laws.