If they all are grown and have jobs,kiss them goodbye,after college if they go to college,if not once they start a job and have sufficient income to support themselves so I would say by at least 21 if they have not reached a self sufficient life before that age ,most parents don't have to go through that because most kids can't wait to leave and some end up back home and yeah there are a few hanger ons that you have to push from the nest....good luck
