Legally, he's an adult in almost all cases (he can't drink alcohol yet). So he's committed a crime as an adult, and this is actually a pretty serious crime. There is absolutely no way that he can convince a judge or anyone else that he thought it was going to be OK to use someone else's credit card, unless he's mentally incompetent. He might get good grades, but he's pretty stupid.
He's going to get caught. He practically signed his name to the crime when he gave his address. He can still go to college, but he won't get hired for a lot of jobs. If the job involves money handling at all, from being a cashier to being a CFO, he has basically forfeited any chance to get such a job. If the job involves any sort of responsibility, he won't get it. He will probably need to rethink his college major, because now there are few jobs that pay good money that will hire him, so he might spend a lot of money on a college degree and be unable to find a job in that field.
And the irony is that he threw away his future for things that are very, very temporary, they will only be useful for a few years.