'Gray headed' in the Bible

And now, behold, the king walks before you. And I am old and gray-headed, and, behold, my sons are with you. And I have walked before you from my childhood to this day.

With us are both the gray-headed and aged, mightier than your father as to days.

He makes a path to shine after him; one would think the deep to be gray-headed.

And now when I am old and gray-headed, O God, do not leave me; until I have declared Your strength to this generation, and Your power to everyone who is to come.