'Year old' in the Bible

which Barzillai was a very aged man, even four score year old, and had provided the king of sustenance while he lay at Mahanaim: for he was a man of very great substance.

I am this day four score year old: and therefore can not discern savoury from unsavoury, neither hath thy servant pleasure in that he eateth or drinketh: nor yet delectation in the songs of men or women. It is no need that thy servant be a burden unto my lord the king: