NEW YORK - With age come such things as catheters, colostomy bags and adult diapers. Now add another indignity to getting old - having to drop your pants and show those things to a complete stranger.

Two women in their 80s put the Transportation Security Administration on the defensive this week by going public about their embarrassment during screenings in a private room at Kennedy Airport. One said she had to lower her pants and underwear in front of an agent so her back brace could be inspected. Another said agents made her pull down her waistband to show her colostomy bag.

While not confirming some of the details, the TSA said a preliminary review shows officers followed the agency's procedures in both cases. But experts said the potential for such searches will increase as the U.S. population ages and receives prosthetics and other medical devices, some of which cannot go through screening machines.

"You have pacemakers, you have artificial hips, you have artificial knees," said Rep. Peter King (R., N.Y.), chairman of the House Homeland Security Committee. "As we get older and we keep ourselves together, it's going to take more and more surgery. There's going to be more and more medical improvements, but that can create what appears to be a security issue."

Prosthetic devices can set off metal detectors, and certain devices such as catheters and bags are visible on body scanners, making those passengers candidates for more thorough inspections. Metal detectors and wands can disrupt some devices such as implanted defibrillators, so passengers with those must ask for pat-downs instead.

Ruth Sherman, 88, of Sunrise, Fla., said she was mortified when inspectors pulled her aside and asked about the bulge in her pants as she arrived for a flight to Fort Lauderdale, Fla., on Nov. 28.

"I said, 'I have a bag here,' " she said on Monday, pointing to the bulge. "They didn't understand."

She said they escorted her to another room where two female agents "made me lower my sweatpants, and I was really very humiliated." She said she stood with her arms and legs outstretched, warning the agents not to touch her colostomy bag. Touching the bag can cause pain, she said.

"It's degrading. It's like someone raped you," Sherman said.

The next day, agents took Lenore Zimmerman, 85, of Long Beach, N.Y., into a private room to remove her back brace for screening after she decided against going through a scanning machine because of her heart defibrillator. Zimmerman said she had to raise her blouse and lower her pants and underwear for a female TSA agent.

Bruce Zimmerman, her son, said the agents "should've patted her down."

"To have her pants and underpants pulled down is just beyond humiliating," he said Monday. "This is my mother we are talking about."

The TSA said Monday it was still investigating the cases.

"Our officers are committed to treating every passenger with dignity and respect," the TSA said in a statement.

The agency insists that security concerns come first, even if it means getting into passengers' drawers. In 2009, a Nigerian man tried to blow up a flight to Detroit on Christmas Day with explosives in his underpants.

"Terrorists and their targets may also range in age," the agency argued in a blog post after Zimmerman went public. It cited the November arrest of four Georgia men, ages 65 to 73, on charges of plotting an attack with the poison ricin. Prosecutors said the men were part of a fringe militia group.

Last June, the daughter of a 95-year-old woman said TSA agents wouldn't let her mother board a flight from Fort Walton Beach, Fla., to Detroit because her wet adult diaper set off alarms.

A TSA screener said Lena Reppert had a suspicious spot on her adult diaper, according to her daughter, Jean Weber. Weber ultimately took off the wet diaper so Reppert could be cleared in time for their flight.

The TSA said its inspectors handled the situation correctly and didn't ask Reppert to remove her diaper.

Such cases raise serious privacy questions, said Chris Calabrese, a legislative expert with the American Civil Liberties Union.

"It's a pretty fundamental invasion of privacy when you have to take your clothes off," Calabrese said.

The TSA says it has been trying to tailor its screening procedures for different types of passengers. In September it eliminated pat-downs for most children under 12 because of complaints from parents.

The agency has formed an advisory committee of 70 disability groups to help adapt its screening techniques.

TSA chief John Pistole has said the agency is trying to train screeners to more quickly identify medical devices, such as catheters, to save passengers from embarrassment. He also said the agency might give preference to senior citizens going through the screening lines.