The final chapter of Jeremiah serves as a closing historical record of the kingdom of Judah. This concluding section runs parallel to the ending of the Book of Kings. While the two accounts cover the same events, they contain specific differences and complementary details that work together to provide a complete picture of the era [רד״ק].
When recording the start of Zedekiah's reign, the stated age reflects the exact time he was actually crowned and took the throne [מצודת דוד]. The historical record also makes a point to mention his mother's name, following a consistent pattern used for all the kings of Judah. Because royal succession passes down the dynasty, the father's identity is naturally known as the previous reigning king. Noting the mother's name provides the necessary specific identification for the new monarch [ביאור שטיינזלץ].