Low key get the feeling that people in this thread arguing over the semantics of calling an 18 year old a man/adult are actually more invested in defending the morality of an 18 year old being in a relationship with a 15 year old. I mean, I'm not particularly bothered by high school seniors dating sophomores either, but people should just say what they mean. Legally, he is most definitely and unambiguously an adult. There's no deception here by the OP or the BBC.
But it's missing the point regardless. The issue here is of course the violent crime committed.
But it's missing the point regardless. The issue here is of course the violent crime committed.