lastborn vs young man

lastborn

noun
  • The youngest child of a family. 

  • The youngest member of any company or organization. 

adj
  • Born last in a family; youngest in a the family. 

  • Younger than anyone else in a group. 

young man

noun
  • A term of endearment or address by adults for a young boy. 

  • Used other than figuratively or idiomatically: see young, man. 

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