'Grey headed' in the Bible

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

Both the greyheaded and the aged are with us, older than thy father.

Now also, when I am old and greyheaded, O God, forsake me not, until I have proclaimed thine arm unto this generation, thy might to every one that is to come.