Jehoiachin was eight years old; of which See Poole on "2 Kings 24:8", where he is said to be eighteen years old.
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.