preteen vs teen

preteen

noun
  • A child between approximately 10 and 12 years of age, at the onset of adolescence. 

adj
  • Of, relating to, or designed for, or being children between the ages of approximately 10 and 12. 

teen

noun
  • Synonym of teenager: a person between 13 and 19 years old. 

  • Vexation; anger; hate. 

adj
  • Of or having to do with teenagers; teenage 

How often have the words preteen and teen occurred in a corpus of books? (source: Google Ngram Viewer )