decrepitude vs golden years

decrepitude

noun
  • the state of being decrepit or worn out from age or long use 

golden years

noun
  • Old age; especially, the leisure years in later life after one has retired from employment. 

  • The period during which someone or something flourishes. 

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