“Only one kind of customer wants to buy lists of seniors interested in lotteries and sweepstakes: criminals,” said Sgt. Yves Leblanc of the Royal Canadian Mounted Police. “If someone advertises a list by saying it contains gullible or elderly people, it’s like putting out a sign saying ‘Thieves welcome here.’ ”

In recent years, despite the creation of a national “do not call” registry, the legitimate telemarketing industry has grown, according to the Direct Marketing Association. Callers pitching insurance plans, subscriptions and precooked meals collected more than $177 billion in 2006, an increase of $4.5 billion since the federal do-not-call restrictions were put in place three years ago.

That growth can be partly attributed to the industry’s renewed focus on the elderly. Older Americans are perfect telemarketing customers, analysts say, because they are often at home, rely on delivery services, and are lonely for the companionship that telephone callers provide. Some researchers estimate that the elderly account for 30 percent of telemarketing sales — another example of how companies and investors are profiting from the growing numbers of Americans in their final years.

While many telemarketing pitches are for legitimate products, the number of scams aimed at older Americans is on the rise, the authorities say. In 2003, the Federal Trade Commission estimated that 11 percent of Americans over age 55 had been victims of consumer fraud. The following year, the Federal Bureau of Investigation shut down one telemarketing ring that stole more than $1 billion, spanned seven countries and resulted in 565 arrests. Since the start of last year, federal agencies have filed lawsuits or injunctions against at least 68 telemarketing companies and individuals accused of stealing more than $622 million.

“Most people have no idea how widespread and sophisticated telemarketing fraud has become,” said James Davis, a Federal Trade Commission lawyer. “It shocks even us.”

Many of the victims are people like Mr. Guthrie, whose name was among the millions that infoUSA sold to companies under investigation for fraud, according to regulators. Scam artists stole more than $100,000 from Mr. Guthrie, his family says. How they took much of it is unclear, because Mr. Guthrie’s memory is faulty and many financial records are incomplete.

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What is certain is that a large sum was withdrawn from his account by thieves relying on Wachovia and other banks, according to banking and court records. Though 20 percent of the total amount stolen was recovered, investigators say the rest has gone to schemes too complicated to untangle.