The age ratings for Colleen Hoover's books are as follows:

Young Adult (14+): Slammed (Slammed Series Book 1), Point of Retreat (Slammed Series Book 2), This Girl (Slammed Series Book 3), Regretting You, Heart Bones, and Never Never (all three parts).

Mature Adult (17+): Hopeless (Hopeless Series Book 1), Losing Hope (Hopeless Series Book 2), Finding Cinderella (Hopeless Series Book 3), Maybe Someday (Maybe Someday Series Book 1), Ugly Love, Maybe Not (Maybe Someday Series Book 2), Confess, November 9, It Ends With Us, Without Merit, All Your Perfects, Maybe Now (Maybe Someday Series Book 3), Finding Perfect (Hopeless Series Book 4), Layla, Reminders of Him, and It Starts With Us.

Very Mature Adult (21+): Too Late and Verity.

These books contain themes and content that may not be appropriate for younger readers. For more detailed information on the age rating of each book, including frequently asked questions, visit the full guide to Colleen Hoover's books.