'Gray headed' in the Bible

And now, behold, the king walketh 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 very aged men, much older than thy father.

Now also when I am old and gray-headed, O God, forsake me not; until I have shown thy strength to this generation, and thy power to every one that is to come.