adolescent vs youngness

adolescent

noun
  • A person who is in adolescence; someone who has reached puberty but is not yet an adult. 

adj
  • Of, relating to, or at the age of adolescence; at the stage between being a child and an adult. 

youngness

noun
  • The state or qualities of being young or youthful; youth. 

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