John Gill Commentary 1 Kings 15:6

"Now there was war between Rehoboam and Jeroboam all the days of his life." — 1 Kings 15:6 (ASV)

And there was war between Rehoboam and Jeroboam all the days of
his life .
] Not the days of Rehoboam, though that was true, and is observed, (1 Kings 14:30) , but all the days of Abijam, before he came to the throne, and in which, when a young man, he was concerned, and which still continued between him and Jeroboam; though some think he is called by his father's name, as Rehoboam is called David, (1 Kings 12:16) .