There is no on site child care there, so he would have to be under your supervision the whole time. They would probably ask for you to pay for him as a guest, or get another account for him. Since all Anytimes are 24 hour gyms, the general rule of thumb is 18+. I've heard of them revoking memberships for bringing unpaid children in after hours, but since each one is privately owned, they each have a little different rules, so I can't say how they would react here.
I would think they do. Better call them to ask.
Thanks! Your answer is awaiting moderation.