dying vs past its prime

dying

noun
  • The process of approaching death; loss of life; death. 

adj
  • Declining, terminal, or drawing to an end. 

  • Pertaining to death, or the moments before death. 

  • Approaching death; about to die; moribund. 

past its prime

How often have the words dying and past its prime occurred in a corpus of books? (source: Google Ngram Viewer )