Old Testament - the collection of books comprising the sacred scripture of the Hebrews and recording their history as the chosen people; the first half of the Christian Bible

patriarch - any of the early Biblical characters regarded as fathers of the human race

codger, old codger - used affectionately to refer to an eccentric but amusing old man

adult male, man - an adult male person (as opposed to a woman); "there were two women and six men on the bus"

golden ager, old person, oldster, senior citizen - an elderly person

antique, gaffer, old geezer, old-timer, oldtimer - an elderly man

patriarch - a man who is older and higher in rank than yourself