2 Kings 24:8

Jehoiachin was eighteen years old when he began to reign, and he reigned in Jerusalem three months. And his mother's name was Nehushta, the daughter of Elnathan of Jerusalem.

Jehoiachin - i:e., God appointed; contracted into Jeconiah and Coniah (Jeremiah 22:24).

Eighteen years old when he began to reign. At the age of eight his father took him into partnership in the government (2 Chronicles 36:9). He began to reign alone at eighteen.