Simplify the following text for a Grade 10 native English-speaking person.
Original: Young-adult fiction or young adult literature ( often abbreviated as YA ) is fiction written for , published for , or marketed to adolescents and young adults , roughly ages 14 to 21 .
Simplified: Young-adult fiction ( often abbreviated as YA ) is fiction written for , made for , or sold to adolescents and young adults , around the ages of 14 to 21 .