Joash was seven years old when he became king.
2 Kings 11:21
The message of Joash and one or two other kings of Israel is interesting: Age does not matter to God. See, Joash was seven (7) years old when he became king of Judah and he turned out to be one of the better kings Judah had. Joash was faithful to God and had a heart for repairing the temple.
This point — that age is not a relevant disqualifier for serving God — needs to be made and reiterated. When I was a younger man — say, thirteen — I got involved in church ministries. I played a part in the drama ministry at the church I then attended. Children younger than that got involved in that same ministry. Our youth did not disqualify us for being used of God. In the case of drama, it uniquely qualified us for certain work. Age does not disqualify in the other direction, either. Moses was 80 when God sent him to Pharaoh. Caleb was 85 when he took possession of the mountains promised to him … and “taking possession” is subtitled “killing giants — plural.” Being “old” does not disqualify a person from God’s service either.
I see two bits of application in this passage. One, I need to put myself in a place where I am ready to be used by God. Caleb was ready. Moses was ready, even though he didn’t know it. Joash was ready, even though he was taking the throne of a kingdom when he was only 7. Two, I need to raise up my daughter in such a way that she, too, is ready for whatever God has for her whenever He has it for her. He may call her to Himself and His service when she is a young girl; He may not call her to active service until she is older. When she is called is not the relevant thing for me, but that I, as a father, raise my daughter in the fear and admonition of the Lord so that she is ready to answer when He calls.