Teens can become members of my guild, but almost never do. I think that is fine, and would like to encourage the next generation to sew, especially since it is generally no longer taught in schools. A separate issue is really young children, 8 or younger. As far as I know, there isn't a problem with anyone bringing young children because they couldn't get a babysitter. I have never seen it. Anyone is welcome at my guild meetings as long as they have a personal interest in quilting. They have to be there for the right reason.