YA books are sometimes divided into two age groups, which are 12 to 15 and 16 to 18. An interesting point to note, though, is that about 50% of YA readers are adults.

The typical word count falls between 50,000 to 80,000 words.

 

Examples
Hunger Games by Suzanne Collins

Divergent by Veronica Roth

The Eden East Novels by Sacha Black