The solvency of the U.S. retirement system partially hinges on how long baby boomers stay in the workforce. If they retire as early as the previous generation, the number of workers per retiree will soon plummet, reducing the tax base and squeezing budgets for Social Security and all other government programs. But new research shows that as the boomers approach retirement they intend to work longer than people born a dozen years earlier, promoting economic growth and partly offsetting the economic pressures created by an aging population.