Verse 13. "Was one and forty years old" - Houbigant thinks he was but sixteen years old when he began to reign; and brings many and forcible arguments to prove that the number forty- one must be a mistake. That he was young when he came to the throne, is evident from his consulting the young men that were brought up with him, chap. x. 8, 10. They were young men then; and if he was brought up with them, he must have been young then also. Besides, Abijah, in his speech to Jeroboam, 2 Chronicles xiii. 7, says that at the time Rehoboam came to the throne he was tender-hearted, and therefore could not withstand the children of Belial raised up against him by Jeroboam: but surely at that time no man could be reputed young and tender-hearted-quite devoid of experience, who was above forty years of age. Besides, if this reading were allowed, it would prove that he was born before his father Solomon began to reign, for Solomon reigned only forty years, and Rehoboam immediately succeeded him.
Verse 15. "Concerning genealogies" - "In the book of the genealogy of the family of David." -Targum.
Verse 16. "Abijah his son" - Concerning the many varieties in this king's name, see the note on 1 Kings xiv. 31.