In the UK, the attitude towards teenagers before and after the age of 18 is like night and day.

Before the age of 18, teenagers used to fight, smash, rob, and smoke every day. After turning 18, classmates in college are all polite, and their friendliness increases. However, influenced by stereotypes, some teenagers still enjoy interacting with peers, but it's not as exaggerated as rumored. The difference is quite significant from a macro perspective, mainly due to legal issues.