I’ve seen Maas’ A Court of Thorn and Roses in the children and young people side at library.
In my country it’s marketed and categorized for 11-12 years old, and given the excerpt I read, from a writing style perspective, this is completely fitting.
Because it is? It’s written like a young adult romance book. I took the book blinldy after reading it’s a take on Battle Royale and it took 10 pages to know that I am too old for this style of writing.