'Gray' in the Bible

But Jacob said, “My son shall not go down with you; for his brother is dead, and he alone is left. If harm should befall him on the journey you are taking, then you will bring my gray hair down to Sheol in sorrow.”

If you take this one also from me, and harm befalls him, you will bring my gray hair down to Sheol in sorrow.’

when he sees that the lad is not with us, he will die. Thus your servants will bring the gray hair of your servant our father down to Sheol in sorrow.