This patient support community is for discussions relating to the challenges of parenting
teens (age 12-17), including physical, emotional, and cognitive development, handling peer pressure, activities & sports, choosing a college, and relationships.
he's 18. he's technically an adult. you can't make him do anything. if you don't like how he's acting give him an ultimatium. either he obeys your rules or he finds a new place to live. my mother did the same thing to my brother. he didn't like so he moved out. he's struggling but my mom isn't caving in to give him what he wants. it's her rules or he doesn't go home. don't baby him. treat him like the adult he wants to be. make him realize life isn't fair. that there are consequences to his actions.
It will get old..he'll enventually see that adult life isn't all so amazing. Staying up late...it'll take its toll. Hanging out with older people...it might just be because he's quite mature and gets along better with older adults.
If you suspect drinking or drugs though, do talk to him. And if he starts having problems, and you know for sure if he's into something he's not...get help.
Good luck :)