aged vs used-to-be

aged

adj

  • Old. 

  • Having the age of. 

  • Having undergone the improving effects of time; matured. 

noun

  • Old people, collectively. 

used-to-be

adj

  • Former, ex-. 

How often have the words aged and used-to-be occurred in a corpus of books? (source: Google Ngram Viewer )