"Not that they say any of this to your face," she added.

　　When older workers do find re-employment, the compensation is usually not up to the level of their previous jobs, according to data from the Heldrich Center for Workforce Development at Rutgers University.

　　In a survey by the center of older workers who were laid off during the recession, just one in six had found another job, and half of that group had accepted pay cuts. Fourteen percent of the re-employed said the pay in their new job was less than half what they earned in their previous job.

　　"I just say to myself: 'Why me? What have I done to deserve this?' " said John Agati, 56, of Norwalk, Conn., whose last full-time job, as a merchandise buyer and product developer, ended four years ago when his employer went out of business.

　　That position paid $90,000, and his rsum lists stints at companies like American Express, Disney and USA Networks. Since being laid off, though, he has worked a series of part-time, low-wage, temporary positions, including selling shoes at Lord & Taylor and making sales calls for a limo company.

　　The last few years have taken a toll not only on his family's finances, but also on his feelings of self-worth.

　　(Read More: Boomers' Average Nest Egg Is $500,000 Short: Study)

　　"You just get sad," Mr. Agati said. "I see people getting up in the morning, going out to their careers and going home. I just wish I was doing that. Some people don't like their jobs, or they have problems with their jobs, but at least they're working. I just wish I was in their shoes."

　　He said he cannot afford to go back to school, as many younger people without jobs have done. Even if he could afford it, economists say it is unclear whether older workers like him benefit much from more education.

　　"It just doesn't make sense to offer retraining for people 55 and older," said Daniel Hamermesh, an economics professor at the University of Texas in Austin. "Discrimination by age, long-term unemployment, the fact that they're now at the end of the hiring queue, the lack of time horizon just does not make it sensible to invest in them."

　　Many displaced older workers are taking this message to heart and leaving the labor force entirely.

　　The share of older people applying for Social Security early spiked during the recession as people sought whatever income they could find. The penalty they will pay is permanent, as retirees who take benefits at age 62 — as Ms. Zimmerman did, to help make her mortgage payments — will receive 30 percent less in each month's check for the rest of their lives than they would if they had waited until full retirement age (66 for those born after 1942).

　　Those not yet eligible for Social Security are increasingly applying for another, comparable kind of income support that often goes to people who expect never to work again: disability benefits. More than one in eight people in their late 50s is now on some form of federal disability insurance program, according to Mark Duggan, chairman of the department of business economics and public policy at the University of Pennsylvania's Wharton School.

　　(Read More: What Dow 14,000 Means for Your Retirement Plan)

　　The very oldest Americans, of course, were battered by some of the same ill winds that tormented those now nearing retirement, but at least the most senior were cushioned by a more readily available social safety net. More important, in a statistical twist, they may have actually benefited from the financial crisis in the most fundamental way: prolonged lives.

　　Death rates for people over 65 have historically fallen during recessions, according to a November 2011 study by economists at the University of California, Davis. Why? The researchers argue that weak job markets push more workers into accepting relatively undesirable work at nursing homes, leading to better care for residents.

　　(Read More: Unemployment Rises, More Quit Looking for Work)

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