Proverbs 20:29 in the King James Version
The glory of young men is their strength: and the beauty of old men is the gray head.
Context
28 Love and faithfulness keep the king safe. His throne is sustained by love.
29 The glory of young men is their strength. The splendor of old men is their gray hair.
30 Wounding blows cleanse away evil, and beatings purge the innermost parts.