you 'll typically see young teens (14ish) by themselves.
they usually get food/water and go back to their room.
i would think most parents would not send young children to the lounge by themselves.
at the breakfast and evening offerings, a sign is out stating that the parents should help their children at the buffet. last time i noticed that sign it said if they are 12 and under.
if the age on the sign has changed, i'm not aware of it.
things change constantly, could be now there isn't a sign.....
(last year at club lounge, i saw very few kids there.)
most parents are concerned and protective on watching out for their kids while on vacation.
in all the times i have stayed at club, i haven't run across any incidents of young children (under 13ish) at the lounge by themselves.
doesn't mean it hasn't happened, just haven't seen it when i have been there.