Young adult fiction

Young adult literature (YA) is typically written for readers aged 12 to 18 and includes most of the themes found in adult fiction, such as friendship, substance abuse, alcoholism, and sexuality. Stories that focus on the challenges of youth may be further categorized as social or coming-of-age novels.

The earliest known use of term young adult occurred in 1942. The designation of young adult literature was originally developed by librarians to help teenagers make the transition between children's literature and adult literature, following the recognition, around World War II, of teenagers as a distinct group of young people. While the genre is targeted at adolescents, a 2012 study found that 55% of young adult literature purchases were made by adults.

From Wikipedia