autobiography vs old saw

autobiography

noun
  • Biographies of this kind regarded as a literary genre. 

  • A self-written biography; the story of one's own life. 

old saw

noun
  • A cliché, saying, or overused expression; especially a proverb or maxim. 

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