'Gray' in the Bible

But he said, "My son shall not go down with you, for his brother is dead and he alone remains. [If] harm meets him on the journey that you would take, you would bring down my gray head in sorrow to Sheol."

And if you take this one also from me, and he encounters harm, you will bring down my gray head in sorrow to Sheol.'

it shall happen [that] when he sees that the boy is gone, he will die. And your servants will bring down the gray head of your servant, our father, to Sheol with sorrow.