nonage vs preadolescence

nonage

noun
  • The state of being under legal age; minority, the fact of being a minor. 

preadolescence

noun
  • The period between childhood and adolescence, between the ages of about 9 and 11 for girls, and 10 and 12 for boys. 

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