Saul was [forty] years old when he began to reign; and when he had reigned two years over Israel,
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.