old lady vs ould one

old lady

noun
  • An elderly woman. 

  • The Bank of England, sometimes referred to as the “Old Lady of Threadneedle Street” or simply “The Old Lady”. 

  • A queen. 

  • One's mother. 

  • One's girlfriend, wife or significant other. 

ould one

noun
  • old woman 

  • mother 

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