Nadia Abdullah was on the hunt for an affordable apartment in the Boston area a few months before she graduated from college.

"It was a little frustrating because I couldn't find anything in my budget," said Abdullah, 25, who was sharing on-campus housing with four other students until she graduated from Tufts University.

At the same time, Judith Allonby, 64, was debating whether to move out of her family's old home in Malden, Mass., after her parents died. Her two-story house seemed too large for one person and it required a lot of upkeep, but she liked the neighborhood.

"I rely on public transportation," said Allonby, an attorney.

Then she and Abdullah discovered an alternative: an intergenerational housing arrangement that would benefit them both.

While researching their options, they each learned about Nesterly, an online home-sharing agency that matches young renters with not-so-young people looking to supplement their incomes and share their space.

Abdullah and Allonby each passed the agency's background check, then they were paired in an arrangement designed to fit their specific needs:

"It was perfect — Judith has become like my family," said Abdullah, who moved in with Allonby in late May 2019 and still lives there. "She even allowed me to adopt a cat. She now loves Mango as much as I do."

Allonby said she was surprised at how compatible they turned out to be.

"It's really nice to have somebody else around, and Nadia brings a different atmosphere and energy than I had with my 88-year-old mother," she said. "Nadia is definitely not listening to Frank Sinatra."

About 18% of Americans live in multigenerational households — meaning two or more adult generations — according to a study from Pew Research Center published this year. Such arrangements have quadrupled in the United States since the 1970s, with about 60 million U.S. residents now living with adults who are of a different generation, according to the study.

Contributing to that trend is that more young people are priced out of the housing market and more seniors want to age in place, said Donna Butts, executive director of Generations United, a D.C.-based organization that focuses on programs and policies that connect generations.

College students faced a similar dilemma with many of their classes held online, she added.

"With young adults and older adults feeling the most isolated, connecting them is the right thing to do," Butts said.

Movie night in Minnesota

In the United States, several universities foster such arrangements, including Quinnipiac University in Connecticut and the University of California at Berkeley, which has an intergenerational housing program that started in 1986.

This fall at Winona Health's Senior Living at Watkins in Winona, Minn., eight Winona State University students will take up residence in the historic Watkins Manor House, which is adjacent to Senior Living at Watkins, an assisted-living community.

The students must complete Winona Health's volunteer training, which includes a background check. They are then required to volunteer at least 10 hours per month with their senior neighbors in any number of activities, including game nights, art and movies.

Krage recalled one student who played cello for the seniors before meals. In turn, the seniors check in with the college students about how a test or school project went.

"A real friendship starts to develop," she said. "They're eating together. There's a family element to it. As we all know, there's a lot we can learn from each other, regardless of age."

At Drake University in Des Moines, music students are given the opportunity to live rent-free at a local senior living center in exchange for performing several times a month for the residents.

Molly McDonough, a 22-year-old vocal performance major, recently moved into Wesley Acres, a senior living community that offers everything from independent apartment life to long-term care.

"It gives me some live performance practice and helps me save on rent at the same time," she said. "I'll be applying to graduate schools this fall and you have to pay a lot in fees, so this move made sense."

She said she was happy to find a pleasant, one-bedroom apartment waiting for her last month on the center's fourth floor.

"It came fully furnished, with towels, dishes and anything else I needed," McDonough said. "They also allowed me to bring my two cats."

In Canada, college students and seniors are moving in together, too.

Michael Wortis, 85, a retired physics professor from Burnaby, British Columbia, near Vancouver, said he was intrigued when he received an e-mail last year from Simon Fraser University, where he'd taught for 15 years.

He was matched with Siobhan Ennis, 27, a health sciences graduate student who had been living with three roommates and was looking for some quiet study space.

In exchange for $400 a month to rent the bottom level of Wortis' home, Ennis now mows the lawn and helps clean up around the house, and she and Wortis dine together several times a week. They also garden together and have movie nights.

"I don't have the same amount of energy that I used to, and it's nice to know that if I fall down the stairs, somebody will come home," Wortis said.

As a bonus, Ennis makes terrific stir-fries, he said, and she's better at figuring out problems with high-tech equipment than he is.

Ennis said she believes that she actually benefits the most from the arrangement.

Nadia Abdullah said she feels the same.

"I'm engaged to be married now, and Judith allowed my fiance to move in with us," she said. "Even when we move out on our own, the bond we have with her will always be there."

Star Tribune staff writer Gail Rosenblum contributed to this report.