Jehoiachin was eight years old See the note on 2 Kings 24:8, in which it is said that he was eighteen years old when he began to reign, which is probably the right reading.
Related Commentaries of 2 Chronicles 36:9
2 Chronicles 36:9
9 Jehoiachin was eight years old when he began to reign, and he reigned three months and ten days in Jerusalem: and he did that which was evil in the sight of the LORD.