'Years' in the Bible

Ish-bosheth, Saul’s son, was forty years old when he became king over Israel, and he reigned for two years. But the house of Judah followed David.

And the time that David was king in Hebron over the house of Judah was seven years and six months.

Jonathan, Saul’s son, had a son whose feet were crippled. He was five years old when the news [of the deaths] of Saul and Jonathan came from Jezreel. And the boy’s nurse picked him up and fled; but it happened that while she was hurrying to flee, he fell and became lame. His name was Mephibosheth.

David was thirty years old when he became king, and he reigned forty years.

In Hebron he reigned over Judah seven years and six months, and in Jerusalem he reigned thirty-three years over all Israel and Judah.

Now it came about after two full years that Absalom had sheepshearers at Baal-hazor near Ephraim, and Absalom invited all the king’s sons [to a party].

So Absalom fled and went to Geshur, and was there for three years.

Absalom lived two full years in Jerusalem, without seeing the king’s face.

And after four years, Absalom said to the king, “Please let me go and pay my vow which I have made to the Lord at Hebron [my birthplace].

Barzillai was a very old man, eighty years old; and he had provided the king with food while he stayed at Mahanaim, for he was a very great and wealthy man.

I am this day eighty years old. Can I [be useful to advise you to] discern between good and bad? Can your servant taste what I eat or drink? Can I still hear the voices of singing men and women? Why then should your servant be an added burden to my lord the king?

So Gad came to David and told him, and said to him, “Shall seven years of famine come to you in your land? Or will you flee three months before your enemies as they pursue you? Or shall there be three days of pestilence (plague) in your land? Now consider this and decide what answer I shall return to Him who sent me.”