I'm wondering if my book fits into the YA genre despite my main character being 19 years old. My story is a fantasy taking place on earth. It deals with angels and demons. However, while my character is 19, we do not see her in college. In fact, the entire story occurs in one week, diving straight into conflict (my main character's 18 year old brother gets kidnapped by a demon and she must save him).
I've been told by a friend who manages a bookstore that my book is YA based on similarity to other YA books. My book is similar to Angelfall by Susan Ee (YA) in terms of tone and some action, therefore leading me to think that age might not be the only deciding factor here.
What do you think? Will my character's age hurt my chances of passing my book as YA?