Genesis 47:8

And Pharaoh said unto Jacob, how old [art] thou?] Or, "how many are the days of the years of thy life?" which way of speaking Jacob takes up, and very pertinently makes use of in his answer that follows: Dr. Lightfoot m thinks Pharaoh had never seen so old a man before, so grave a head, and so grey a beard, and in admiration asked this question.

m Works, vol. 1. p. 667.