To give you an idea, the number of people who are over 65 at the moment's about 16 percent; in 40 years' time it's 26 percent—more than one in four people eligible for the pension. And by the time you take out kids that don't pay any tax—and there always seem to be a few people on unemployment benefit, especially under Labour—then the number of people left to pay the bills is vanishingly small.