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Gwendolyn Ross will turn 66 in November, but she isn't ready to retire. A deputy comptroller for the U.S. Coast Guard in Miami Beach, Florida, she hopes to work until she's 70—but she would like to cut back her hours.

"I have some health issues that require a lot of visits to the doctor, and I'd love to have more time to visit my family in Michigan," she says. At the same time, she needs to keep working to prepare for retirement. "As I get closer to it, I realize I'm not as financially ready as I thought I would be when I was younger. The time went by really quickly."

Ross is a great candidate for a new federal government program that will allow workers to opt for a phased retirement. Participants in the program, which launches this fall, will be able to work half-time while collecting half their pensions after they reach the eligible retirement age.

For the government, the program is expected to be a money saver. The Congressional Budget Office estimated recently that 1,000 employees might take advantage of phased retirement annually, and would continue work for three years. That would cut required contributions to the government's pension system by $427 million from 2013 to 2022, and boost worker contributions by $24 million.

But phased retirement also will help the government retain talent and expertise at a time when the "brain drain" from an aging workforce is a major concern. About 600,000 people, or 31% of the federal civilian workforce, will be eligible for retirement by September 2017, according to the U.S. Government Accountability Office. Phased retirees will be required to spend at least 20% of their time mentoring younger employees.

"It can help people who want to phase out over time, but it makes sense for the whole workforce," says Kevin E. Cahill, a research economist at Boston College's Sloan Center on Aging and Work. "Younger workers can tap into the knowledge that the older crowd has, and make sure it doesn't get lost lost."

Worker interest in a flexible glide path to retirement is strong, and it's not limited to the federal payroll. A survey this year by the Transamerica Center for Retirement Studies found that 64% of workers—of all ages—envision a phased retirement involving continued work with reduced hours. For workers closest to retirement, frequently cited reasons for continued work included financial need (34%) and a desire for income (19%). But 34% had a desire to "stay involved" or said they enjoyed their work.

Employers have been slow to respond. Just 21% of respondents to the Transamerica survey said their employers offer phased retirement—and that figure may be too optimistic.

The Society for Human Resource Management reports that 11% of employers provide some version of phased retirement, with only 4% having formal programs. Cahill's research shows similar employer disinterest in phased retirement programs.

"Sometimes there are institutional or administrative restrictions," he says. "And some employers may have good reasons not to offer flexible hours."

Much more common, he found, are workers who find what they need by changing jobs. "These are bridge jobs that carry people through from their careers to withdrawal later on from the labor force," he says.

Some experts think phased retirement options will become more popular as the economy improves and labor markets tighten, particularly as demand for specialized skills rises. And the federal government's move could be a catalyst for change in the private sector.

Each federal agency will write its own eligibility rules, and phased retirement won't be a guaranteed right for all workers. But basic eligibility will depend on which of the two major federal retirement programs covers an employee.

The government has a legacy Civil Service Retirement System (CSRS), a traditional defined-benefit system, and the newer Federal Employees Retirement System (FERS), a defined-contribution program with a small traditional pension component.

CSRS employees will be eligible for phased retirement at age 55 with 30 years of service, or at 60 with 20 years of service. FERS employees must be 60 with 20 years of service, or have 30 years of service and have reached their minimum retirement-eligible age.

Interest in the program is strong, according to Jessica Klement, legislative director of the National Active and Retired Federal Employees Association.

"The number of phone calls we get from members tells me there are a lot of people waiting for this," she says. "Many of them are ready to take a step back, but they don't really want to quit yet."