ageful vs eonian

ageful

adj

  • Eternal, everlasting. 

  • Aged, elderly, old. 

noun

  • An eternity, a perpetuity. 

eonian

adj

  • everlasting 

  • Of or pertaining to an eon 

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