Verses with the word gray in the Old Testament (5 verses):

Genesis 42:38
And he said, My son shall not go down with you; for his brother is dead, and he is left alone: if mischief befall him by the way in the which ye go, then shall ye bring down my gray hairs with sorrow to the grave.

Genesis 44:29
And if ye take this also from me, and mischief befall him, ye shall bring down my gray hairs with sorrow to the grave.

Genesis 44:31
It shall come to pass, when he seeth that the lad is not with us, that he will die: and thy servants shall bring down the gray hairs of thy servant our father with sorrow to the grave.

Deuteronomy 32:25
The sword without, and terror within, shall destroy both the young man and the virgin, the suckling also with the man of gray hairs.

Hosea 7:9
Strangers have devoured his strength, and he knoweth it not: yea, gray hairs are here and there upon him, yet he knoweth not.