geriatric vs prediluvian

geriatric

noun
  • An old person. 

adj
  • Relating to geriatrics. 

  • Relating to the elderly. 

  • Elderly, old. 

prediluvian

noun
  • One who lived before the Flood; an antediluvian. 

adj
  • Before the Flood; antediluvian. 

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