In the seventh year of Jehu, Joash [a] became king, and he reigned in Jerusalem forty years. Joash [d] was seven years old when he began to reign, his mother's name was Zibiah; she was from Beersheba. Joash did what was right in the eyes of the LORD all the years Jehoiada the priest instructed him. The high places, however, were not removed; the people continued to offer sacrifices and burn incense there.
Joash said to the priests, "Collect all the money that is brought as sacred offerings to the temple of the LORD -the money collected in the census, the money received from personal vows and the money brought voluntarily to the temple. Let every priest receive the money from one of the treasurers, and let it be used to repair whatever damage is found in the temple."
Jehoiada the priest took a chest and bored a hole in its lid. He placed it beside the altar, on the right side as one enters the temple of the LORD. The priests who guarded the entrance put into the chest all the money that was brought to the temple of the LORD. Whenever they saw that there was a large amount of money in the chest, the royal secretary and the high priest came, counted the money that had been brought into the temple of the LORD and put it into bags. When the amount had been determined, they gave the money to the men appointed to supervise the work on the temple. With it they paid those who worked on the temple of the LORD -the carpenters and builders, the masons and stonecutters. They purchased timber and dressed stone for the repair of the temple of the LORD, and met all the other expenses of restoring the temple.

Who read that this guy was only seven years old? I think that would be a lot of work for that priest to try to give him advice.