the average marriage now lasts ____ years quizlet
National Divorce Rate: 30.7%. According to the Economist, couples in Italy stay together longer than any other country evaluated. Istat dives into these numbers a little deeper, noting that the average marriage lasts 15 years up until separation or 18 up until divorce. Regardless of how long couples stay together, marriage, as an institution, has fallen out of favor with couples. As of 2010, separation and divorce rates grew.