elderly vs eldern

elderly

adj
  • old; having lived for relatively many years. 

  • Of an object, being old-fashioned or frail due to aging. 

noun
  • An elderly person. 

  • Older people as a whole. 

eldern

adj
  • Elder; elderly; aged; old. 

  • Not new; old; ancient. 

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