During Asa’s Reign, he did good in the eyes of The Lord. He got rid of the idols and broke them down. He even removed his Grandmother, Maacah from her position as Queen Mother because she had idols.
Asa was 20 years old when he came to power in approximately 913-873 BC. He was the 1st King since David, his great-great-grandfather that followed The Lord.
He did fall away later in his reign when he went to people instead of God to solve his problems.
This shows that however long you follow The Lord, you can fall away, so it is a lifelong commitment to surrender your life over to Him.