There was famine in the days of David for three consecutive years; and David sought the presence (face) of the Lord [asking the reason]. The Lord replied, “It is because of Saul and his bloody house, because he put the Gibeonites to death.”

and in his polling his head -- and it hath been at the end of year by year that he polleth it, for it is heavy on him, and he hath polled it -- he hath even weighed out the hair of his head -- two hundred shekels by the king's weight.

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.

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

And it came to pass, after the year had expired, at the time when kings go forth to battle, that David sent Joab, and his servants with him, and all Israel; and they destroyed the children of Ammon, and destroyed Rabbah. But David tarried still at Jerusalem.