faculty vs mental age

faculty

noun
  • an ability, power, or skill. 

  • A licence to make alterations to a church. 

  • A division of a university. 

  • The members of a profession. 

  • The academic staff at schools, colleges, universities or not-for-profit research institutes, as opposed to the students or support staff. 

  • An authority, power, or privilege conferred by a higher authority. 

mental age

noun
  • How old one appears to be based solely on mental ability and function. 

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