"Now there's the peace of mind of knowing the limits of my obligation if I have catastrophic health needs," he said.
Dr. Bernd Wollschlaeger said he's noticed a recent increase in patients in this age group at his family practice in Miami. Lots of them have untreated chronic conditions that have progressed to an advanced stage.
"Many have delayed necessary treatments due to costs and expect a total and quick workup on their first visit," he said, adding they want referrals to specialists and tests including colonoscopies and mammograms.
The abundance of older patients signing up is no surprise to the Obama administration, which conducted internal research last year that showed the "sick, active and worried" would be the most responsive to messages urging them to seek coverage.
Signing up younger, healthier enrollees is seen as more difficult, but crucial to keeping future insurance rates from increasing. The administration said those age groups may put off enrolling until closer to the March 31 deadline.
"We have always anticipated that those with more health needs would sign up early on, and that young and healthy people would wait until the end," administration spokeswoman Joanne Peters said.
Some of the aging boomers were determined to get coverage in the marketplace, despite repeated problems and frustration with the federal website.
The hours spent online and over the phone paid off for real estate agent Greg Burke and his beautician wife, Pat. The empty-nesters qualified for a tax credit that will lower their monthly health insurance premiums by nearly half.
The Burkes, from Akron, Ohio, are among the 38 percent of marketplace enrollees in the state between 55 and 64 years old. He's 61 and had a knee replaced six years ago.
They will now spend $250 a month for health insurance, "a huge savings," Greg Burke said. Their deductibles also dropped from $2,500 each to $750 each, meaning they will pay less out of pocket.
In Miami, licensed practical nurse Marie Cadet, who is 54, often works double shifts to make ends meet for herself and her 12-year-old daughter. She had been paying more than $150 a month for health insurance, with a $3,000 deductible. In effect, she paid most medical costs out of her own pocket, including about $80 a month for blood pressure medicine.
After choosing a plan from the marketplace, Cadet's monthly payment dropped to $86 a month, with the government kicking in $300. Her deductible fell to a more affordable $900.
"Now," Cadet said, "I'm not scared anymore."
Associated Press writers Ramit Plushnick-Masti in Houston, Ann Sanner in Columbus, Ohio, and Kelli Kennedy in Fort Lauderdale, Fla., contributed to this report.
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