Linda Poskanzer was having a tough time in her late 60s.

“I was not doing well emotionally,” she recalled. “Physically, I didn’t have any stamina. I was sleeping a lot. I wasn’t getting to work.”

A therapist in Hackensack, N.J., Poskanzer was severely overweight and grew short of breath after walking even short distances. Her house had become disorganized, buried in unsorted paperwork. The anti­depressant she was taking didn’t seem to help.

Her son, visiting from Florida, called his sisters and said, “Mommy needs an intervention.”

One of her daughters made an appointment with a geriatrician — a physician who specializes in the care of older adults. Dr. Manisha Parulekar, now chief of geriatrics at Hackensack University Medical Center, suggested her new patient take action on several fronts. She arranged for a sleep study, which found that Poskanzer suffered from apnea. She prescribed a different antidepressant and physical therapy in a pool to help rebuild her stamina.

And weight loss. Eventually, the geriatrician agreed that bariatric surgery made sense. Over nine months, Poskanzer lost 75 pounds; she has shed another 15 since.

Now about to turn 80, Poskanzer is still receiving therapy, 30 hours each week, feels “full of spirit” and continues to see her geriatrician every four months. “She sits and talks, which a lot of doctors don’t do anymore,” Poskanzer said. “And she knows me. I feel very well taken care of.”

Testimonials like this spotlight the rising need for geriatricians. These doctors not only monitor and coordinate treatment for the many ailments, disabilities and medications their patients contend with, but also help them determine what’s most important for their well-being and quality of life.

Patients like Poskanzer often can’t easily find geriatricians like Parulekar, however. As the nation’s older population surges, the gap between need and supply has steadily widened, and a persistent shortage of geriatricians has troubled the medical profession for years.

Geriatrics became a board- certified medical specialty only in 1988. An analysis published in 2018 showed that over 16 years, through the academic year 2017-18, the number of graduate fellowship programs that train geriatricians, underwritten by Medicare, increased to 210 from 182. That represents virtually no growth when adjusted for the rising U.S. population. “It’s basically stagnation,” said Aldis Petriceks, the study’s lead author, now a medical student at Harvard.

Moreover, geriatrics fails to attract enough young doctors to the graduate fellowships it does offer. Leaving aside geriatric psychiatry, more than a third of 384 slots went unfilled last year, the American Geriatrics Society reports.

If one geriatrician can care for 700 patients with complex medical needs, as a federal model estimates, the nation will need 33,200 such doctors in 2025. It has about 7,000, only half of them practicing full time.

Why do so few residents choose to specialize in geriatrics? Though salaries are rising, total compensation (wages along with certain benefits) for geriatricians in 2018 averaged $233,564, according to the Medical Group Management Association. Anesthesiologists earned twice as much; radiologists and cardiologists topped $500,000.

“These are smart people looking at economic reality,” said Dr. Mark Supiano, a geriatrician and researcher at VA Salt Lake City Health Care System. Treating patients covered by Medicare, which pays less than commercial insurance, is a slow way to repay medical school loans.

Nor does the field offer much glamour or the prospect of medical heroics. “Having patience, having good communication skills, it’s a different personality than being a surgeon,” Supiano acknowledged. Yet a much-cited 2009 survey of 42 medical specialties found that geriatricians reported higher career satisfaction than most.

Not every older person needs a geriatrician, but the federal model estimates that 30% of the over-65 population does. This is especially true “when someone has three or more chronic conditions and is over 85,” said Nancy Lundebjerg, chief executive of the American Geriatrics Society.

That describes Dorothy Lakin, 93, whose recent medical history includes heart failure, macular degeneration, falls, colon cancer and heart valve surgeries, and a stroke.

“She’s had a zillion trips to the ER, one after another,” said her daughter Mary Ellen Lakin, 70, who lives in Newton, Mass. “I thought, ‘Let’s see if there’s a way to make her life easier.’”

Mary Ellen Lakin found her way to Dr. Laura Nelson Frain, a geriatrician at Brigham and Women’s Hospital in Boston, who has gently steered mother and daughter through the past year. She reduced the number of medications Dorothy Lakin took and the specialists she saw, stayed in touch with Mary Ellen and sent a geriatric nurse- practitioner to make house calls.

“It’s less of ‘Let’s order this med, let’s order that procedure,’ more of a holistic approach,” Mary Ellen Lakin said. Her mother recently entered hospice care.

Still, given the numbers, “we’re not going to address this growing older population through some miraculous influx of specialized geriatricians,” Petriceks said.

Leaders in geriatrics agree, and while they continue working to bolster their numbers, they’re also adopting other strategies. Dr. Mary Tinetti, chief of geriatrics at the Yale School of Medicine, has called for geriatricians to serve as “a small, elite workforce” who help train whole institutions in the specifics of care for older adults.

“The most important thing geriatricians can do is make sure all their other colleagues” understand these patients’ needs, she said, including nurse-practitioners, physician assistants and pharmacists.

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