Manasseh was Judah's worst king. Only Chronicles records his repentance and salvation late in life.
2 Chronicles 33:9-13
Thus Manasseh misled Judah and the inhabitants of Jerusalem to do more evil than the nations whom the LORD destroyed before the sons of Israel. The LORD spoke to Manasseh and his people, but they paid no attention. Therefore the LORD brought the commanders of the army of the king of Assyria against them, and they captured Manasseh with hooks, bound him with bronze chains and took him to Babylon. When he was in distress, he entreated the LORD his God and humbled himself greatly before the God of his fathers. When he prayed to Him, He was moved by his entreaty and heard his supplication, and brought him again to Jerusalem to his kingdom. Then Manasseh knew that the LORD was God.
A man in leadership can easily corrupt and destroy the people in his charge. Even a personal turning to God and righteousness will not restore the loss or reverse the wages of sin done to others. To follow God wholeheartedly from your youth is worth more than a thousand testimonies of men and women rescued from the destruction of sin later in life. Those saved later in life rejoice in the mercy of God, and at the same time look back with shame on their previous lifestyles and the damage they did to the lives of others. Years after his salvation, Paul still called himself the chief of sinners for his persecution and murder of Christians.
Turn to the Lord Jesus when you are young. Serve Him wholeheartedly your whole life. That is the best testimony for God!
For me to live is Christ.