Things are expected to deteriorate after that, mainly because of the impact of an aging population on Medicare and Social Security. But there has been a dramatic slowdown in the growth of health care costs, which used to play a big role in frightening budget scenarios. As a result, despite aging, debt in 2039 — a quarter-century from now! — is projected to be no higher, as a percentage of G.D.P., than the debt America had at the end of World War II, or that Britain had for much of the 20th century. Oh, and the budget office now expects interest rates to remain fairly low, not much higher than the economy’s rate of growth. This in turn weakens, indeed almost eliminates, the risk of a debt spiral, in which the cost of servicing debt drives debt even higher.

Still, rising debt isn’t good. So what would it take to avoid any rise in the debt ratio? Surprisingly little. The budget office estimates that stabilizing the ratio of debt to G.D.P. at its current level would require spending cuts and/or tax hikes of 1.2 percent of G.D.P. if we started now, or 1.5 percent of G.D.P. if we waited until 2020. Politically, that would be hard given total Republican opposition to anything a Democratic president might propose, but in economic terms it would be no big deal, and wouldn’t require any fundamental change in our major social programs.

In short, the debt apocalypse has been called off.

Wait — what about the risk of a crisis of confidence? There have been many warnings that such a crisis was imminent, some of them coupled with surprisingly frank admissions of disappointment that it hadn’t happened yet. For example, Alan Greenspan warned of the “Greece analogy,” and declared that it was “regrettable” that U.S. interest rates and inflation hadn’t yet soared.

But that was more than four years ago, and both inflation and interest rates remain low. Maybe the United States, which among other things borrows in its own currency and therefore can’t run out of cash, isn’t much like Greece after all.

In fact, even within Europe the severity of the debt crisis diminished rapidly once the European Central Bank began doing its job, making it clear that it would do “whatever it takes” to avoid cash crises in nations that have given up their own currencies and adopted the euro. Did you know that Italy, which remains deep in debt and suffers much more from the burden of an aging population than we do, can now borrow long term at an interest rate of only 2.78 percent? Did you know that France, which is the subject of constant negative reporting, pays only 1.57 percent?