infancy vs sweet sixteen

infancy

noun
  • The state of being a minor. 

  • An early stage in the development of anything. 

  • The state of being an infant. 

  • The earliest period of childhood (crawling rather than walking). 

sweet sixteen

noun
  • sixteen 

  • A girl's sixteenth birthday, or sixteenth-birthday party and a related coming of age party. 

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