But in my mind, I don't think any of us (or I) will even suggest our kids, someone who is known, a close relative or friends who is not adult yet to join the forum.
I don't suggest it for another reason: privacy.
We have gambling sub-board, there are no rules need to mention that one doesn't need to be 18+
Agreed. But kids could just skip those boards, just like they can skip many other gambling websites.
We have reputation sub-board, people do not mind to use in-appropriate slang towards each others
I haven't seen anything worse on Bitcointalk than what I've heard at schools

I don't think I will encourage my girl to read what I write, not at least she become 18 or at least adult enough to handle the world of adults.
I won't encourage it, but if my kids find their way to a Bitcoin forum online, I'd be proud

I'm pretty sure there are much more dangerous websites than Bitcointalk. I already teach my kids not to use their real name (in games), and they use email addresses without any personal information for registration. When they're a bit older, I'll add the dangers of the internet to the list. I can't wait until they're 18 to release them into the wild, they need to learn, and the best time to do so is while they're young.
In public schools and the free world of the internet, we have no boundary for anything. I have seen kids not even 12 years (both) old, if my guess is not so wrong, are kissing openly like we adult do with our spouse when making love, as they don't care what's around them. A young kid of a close relative started to live with
boyfriend, left his parents, cut off all connections with everyone in the family tree does not surprise me too. Other day in gambling discussion I heard about this sex competition. All of it do not feel right but there are no way to deny too. I don't know how much I will be able to protect my children from all these uncomfortable events we witnessed but I am trying to provide the best I can for her to grow up safely.
None of it now meta related between you and me LOL. It's sounds like two father (If you have no dispute that you are the mother 🤣) is having discussion or what they do and don't want to see in their children to do with Bitcointalk until they become adult. We both need to shut up now LOL