preteen vs youth

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. 

youth

noun
  • A young person. 

  • A young man; a male adolescent or young adult. 

  • The quality or state of being young. 

  • The part of life following childhood; the period of existence preceding maturity or age; the whole early part of life, from childhood, or, sometimes, from infancy, to adulthood. 

  • Young persons, collectively. 

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