goodtoread.org
http://goodtoread.org/age-range/

Books aimed at ...

Young Children - Children 6 or under

Children - Children aged 7 to 10

Children+ - Age 7 and upwards

Pre Teens - Ages 10 to 12

Pre Teens+ - Age 10 and upwards

Young Teens - Ages 13 to 14

Young Teens+ - Ages 13 and upwards

Mid Teens - Ages 15 to 17

Mid Teens+ - Age 15 and upwards

Adult - Age 18 and upwards

General - All ages