Dr. Seuss wrote Children's Books primarily aimed at young readers, typically ranging from preschool to elementary school age (approximately 4-8 years old). His books are known for their whimsical illustrations and imaginative storytelling that appeal to a wide audience of young readers.
4
Age 13
Kate DiCamillo's books are typically classified as children's literature and are generally targeted towards readers in the middle grade age group, typically between 8 to 12 years old. Her books often feature themes and language that resonate with this age group.
The age group considered young adults when selecting books is typically between 12 and 18 years old.
She's an author. It's her job to write books.
3-7
Young adults
at 14 years old
Young adult books target readers typically between the ages of 12 to 18.
Jeff Kinney wanted to write books because he noticed a lack of engaging literature for children that focused on the experiences of middle school kids. He aimed to create a series that would reflect the humor and challenges of that age group, drawing inspiration from his own childhood.
The Warrior cats books have been categorized as being for Children and Young Adults, but according to the authors, they never really intended for the books to be for a specific age group.
It's subjective, but I'd say ages 3-8.