Psalm 71:18 in the King James Version
Now also when I am old and grayheaded, O God, forsake me not; until I have shewed thy strength unto this generation, and thy power to every one that is to come.
Context
17 God, you have taught me from my youth. Until now, I have declared your wondrous works.
18 Yes, even when I am old and gray-haired, God, don’t forsake me, until I have declared your strength to the next generation, your might to everyone who is to come.
19 God, your righteousness also reaches to the heavens. You have done great things. God, who is like you?