Starting to get major pushback from DC on going to bed. DS11 & DD13.. always been pretty strict with school night bedtimes but they're both taking longer & longer to settle down for evening. DD likes to follow a routine where we watch tv together after her brother goes up around 8.30... she's still faffing upstairs now (9.20) & her bedtime 'should' be 9.15.. she just keeps saying 'ok I'm coming' when I repeatedly nag her & tbh I've given up now.. do we even bother enforcing bedtimes at this age?! If we demand it and threaten consequences it turns into such a drama it's just not worth it at this time of night as prolongs things & ends with her getting in a state. I feel I don't have much leverage. At this rate I'll be going to bed before her.
Then the boy has started doing the same.. goes up fine & find him sat in his pants playing in his room when I thought he'd gone to bed 
How do you enforce bedtimes as they get older & when do you give up?!