But now your kingdom shall not continue: Yahweh has sought him a man after his own heart, and Yahweh has appointed him to be prince over his people, because you have not kept that which Yahweh commanded you.
The first problem is Saul’s age when he began to reign. No other text of Scripture gives us his age at this time. The NASB translators have supplied "40" and the NIV and NET translators "30." The AV translators wrote, "Saul [was . . . years old]," leaving the number undefined.