“They tell you, ‘We’re sorry, we can’t get any people to come and look,’ ” Ms. Scher said. “If I can’t sell here, I can’t go nowhere.”

There is no way to say how many older Americans are in similar straits, as no statistics track how many of America’s 4.27 million unsold homes are owned by people 65 or older. But industry groups and administrators at retirement homes call the problem a growing one, which worsened as the financial crisis spread from real estate to lending markets. It has been felt worst in regions hit hardest by the housing bust.

“It remains to be seen whether we have a short-term stress, or whether we’re facing a crisis,” said Mr. Minnix, of the Association of Homes and Services for the Aging. “We’re into brand new territory here. It is deeper and potentially broader.”

Across the country, occupancy rates for independent and assisted-living facilities have fallen slightly in the last year, by about 2 percent through the middle of 2008, according to the National Investment Center for the Seniors Housing and Care Industry.

But the problem is playing out acutely in hard-hit areas like Florida, where the vacancy rate at some facilities is up 20 percent to 30 percent over last year, said Paul Williams, director of government relations for the Assisted Living Federation of America. At Luther Manor, a retiree community in Milwaukee, the number of residents moving into independent living has dropped 20 percent this year. In southern Ohio, 65 percent of the people who visited the Bristol Village retirement community this year said they could not buy a unit because their homes were still hanging around their necks.

For these businesses, each occupied room generates thousands of dollars each year. Retirement condos charge monthly fees ranging from a few hundred dollars to $5,000, while the average price for private-pay care in assisted living is $3,013 per month, or $36,156 per year, according to a MetLife study.

At the Crosby Commons assisted-living center in Shelton, Conn., where waiting lists that once ran two years or more have shrunk to six months, some residents who moved before selling their homes are spending through their savings as they wait, said Lois Poultney, the center’s director. One resident had to move from Crosby’s free-market homes to its subsidized rent-controlled apartments, Ms. Poultney said.