I don’t know about anyone else, but I am really frustrated by the category Young Adult, aka YA, in fiction. I swear, if you ask ten different people to define “young adult” you get ten different answers.
The basis is usually the same and the actual definition is that the story must appeal to a teenage audience and be marketed towards them. But then things diverge quickly from there. Some people claim that the main characters themselves must been teenagers (i.e. Young Adults). Some people claim that the characters don’t need to teenagers, but that they must deal with the problems teens face. Some claim that it is ONLY a distinction in how the book is marketed, i.e. to Young Adults as previously stated. Some people even claim that a story being written in cinema style third person omniscient POV makes a story YA.