'Gray headed' in the Bible

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 youth to this day.

Therefore he brought on them the king of the Chaldeans, who killed their young men with the sword in the house of their sanctuary, and had no compassion on young man or virgin, old man or gray-headed: he gave them all into his hand.

With us are both the gray-headed and the very aged men, much elder than your father.