Nightlife for 35-40yo

I lived in Seoul during my early 20s and frequented Hongdae to hit the bars and clubs. In my late 20s and early 30s I spent time in itaewon and Gangnam. Coming back to visit with a group of friends age 35-40 (I’m 40😟) but the youngest in the group is 30. What are some good spots to go out and not feel like our parents? We are celebrating a milestone and there are a few first timers in Seoul. Thanks in advance!