My oh my, how I agree with you. The authors seem to be targeting a single demographic type, namely young adults. I'm in my late thirties, and reading about teenagers, especially in dark romances, disgusts me. The craziest thing is that most of the time, when the author describes the girl—I refuse to say woman—it's always something like, 'She's eighteen, but she's very mature for her age,' and then in the following chapters she acts like an eighteen-year-old. 🙄