Well, it looks like you have a decent amount of interest in this, so a GC wouldn’t fit everyone, and a topic thread would expire if there was a week lul in the chat. May I suggest making an “All Grown Up” personal space? There is a Teen Crafters space, so why not a public Grown Up space? (I’m assuming the group you are wanting to set up is not for duscussing mature themes, but simply a space for chatting amongst those with more years experience than our wonderful school-age youth friends here on Ribblr)
Here’s the link to ask Ribblr to set up a space: