1 Chronicles 29:28 -

We learn from 2 Samuel 5:4 , 2 Samuel 5:5 , that David was thirty years old when he began to reign in Hebron. He must, therefore, have died in his seventy-first year. That this is called here a good old age shows that the length of human life had now greatly subsided. In comparison of all his successors on the thrones of Judah and of Israel, his age was clearly a "good old age?'