This tag should be used for questions about writing intended for readers between 12 and 18 years old. (Often abbreviated YA.) For readers ages 8-12 use [middle-grade]. For readers under 8 use [children]. For questions about characters, use [child-characters]. For questions about children or teens who are writers, use [young-author].
This tag can be used for questions about fiction or nonfiction, as long as it is aimed for readers in their teens.
The protagonist is usually also in that age range, and the content frequently touches on problems and challenges which people that age face (first serious romance, first sexual experience, coming-of-age stories). YA novels span all genres. Exact age ranges may vary publisher to publisher.
For readers ages 8-12 use middle-grade
For readers under 8 use children
For questions about characters who are children (especially in adult books), use child-characters
For questions about children or teens who are writers, use young-author