How long did David live? From my general knowledge, I know that David lived 70 years.  Can be this be demonstrated with the Bible?
In 1 Kings 2:10, 11 we find how long he reigned over Israel:

So David slept with his fathers, and was buried in the city of David.
And the days that David reigned over Israel were forty years: seven years reigned he in Hebron, and thirty and three years reigned he in Jerusalem.

So, how long did David live?
70 years


  David was thirty years old when he became king, and he reigned forty years. 
  2 Samuel 5:4