2 Chronicles 36:9 Commentary - English Annotations on the Holy Bible by Matthew Poole
Jehoiachin was eight years old; of which See Poole "2Ki 24:8", where he is said to be eighteen years old.
Consult other comments:
2 Chronicles 36:9 - Albert Barnes' Notes on the Bible
2 Chronicles 36:9 - Joseph Benson’s Commentary on the Old and New Testaments
2 Chronicles 36:9 - The Cambridge Bible for Schools and Colleges
2 Chronicles 36:9 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 36:9 - Commentary on the Holy Bible by Thomas Coke
2 Chronicles 36:9 - College Press Bible Study Textbook Series
2 Chronicles 36:9 - Companion Bible Notes, Appendices and Graphics
2 Chronicles 36:9 - Expository Notes of Dr. Constable (Old and New Testaments)
2 Chronicles 36:9 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 36:9 - Garner-Howes Baptist Commentary
2 Chronicles 36:9 - Geneva Bible Notes
2 Chronicles 36:9 - John Gill's Exposition of the Entire Bible
2 Chronicles 36:9 - Hawker's Poor Man's Commentary (Old and New Testaments)
2 Chronicles 36:9 - Keil & Delitzsch Commentary on the Old Testament
2 Chronicles 36:9 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 36:9 - Old and New Testaments Restoration Commentary
2 Chronicles 36:9 - John Trapp's Complete Commentary (Old and New Testaments)
English Annotations on the Holy Bible by Matthew Poole

Matthew Poole (1624–1679) wrote English Annotations on the Holy Bible, completing the chapters as far as Isaiah 58 before his death in 1679. The rest of the Annotations were completed by friends and colleagues among his Nonconformist brethren. The first printing of the completed edition was in 1685, 2 volumes folio, followed by editions in 1688, 1696 (with valuable chapter outlines added by the editors, Samuel Clark and Edward Veale), and the 4th and definitive edition in 1700, the basis of all others.