light_novel_addict
There are two things that don't make sense if he's already 18. Being of legal age, he doesn't need a legal guardian, as mentioned before; it's a university, so having a guardian is implausible. The other thing is the broom. It made sense when they were 11 and it was a danger, but now they could easily be part of the Quidditch team in the first year with their current age.