There should be a word for that sinking sensation you have when, at a merry ongoing vintage, you realise you've stumbled into the land of young adult fiction. It happened to me recently when I selected a movie called Fifth Wave, which with hindsight I should have realised, but it seemed mindless seatback entertainment. Don't bother, it's risible and awful. It's basically Twilight. Admittedly it didn't make quite as angry as Twilight because of what they did to vampires (and you shouldn't include Buffy as YA, because it wasn't), but it's dismally cynical fodder for teenage girls.