NEW YORK — A year ago, Robert E. Elson began noticing a curious new array of beverages in the refrigerator of the condo he shares with his wife, Roni, on the Upper West Side: energy drinks and “different coffees that were totally alien,” recalled Elson. “And there were these different milks.

“I’d see almond milk and I’d go, ‘Oh, my God,’” he said.

The appearance of almond milk and its kin coincided precisely with the residency of the Elsons’ granddaughter Madeline David, who had just begun graduate work at the Climate School at Columbia University.

“She was accepted into the program, and that was the good news,” said Robert Elson, 82, a salesperson at the real estate agency Coldwell Banker Warburg. “The bad news was that her parents told us that Madeline was going to have a problem with the room and board.

“We told them: ‘Well, we’re here. We have an extra room so why doesn’t she come stay with us?’” Elson said.

They became grand-mates — nearly six decades apart in age.

According to a recent survey by Credit Karma, a personal finance platform, nearly one-third of Americans ages 18 to 25 live at home with their parents or other relatives. “We’re hearing more and more about adult grandchildren living with grandparents,” said Donna Butts, the executive director of Generations United, a nonprofit based in Washington that promotes programs and policies that connect generations.

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Grandparents are there to step in — just as many of them do when the grandchildren are little, said Natasha Pilkauskas, an associate professor of public policy at the University of Michigan, who studies the living arrangements of children.

According to 2017 research by Pilkauskas, about 10% of Black children lived in so-called skipped-generation households at some point in their lives from birth to age 18; the numbers were lower among Latino, Asian and white children. “Given the pandemic, these figures may now be underestimates,” she added.

Once the grandchildren are older, Butts said, “skipped-generation” relationships are stronger because the grandchildren and grandparents can approach each other as individuals. Grandparents, in this instance, aren’t seen as authority figures, and grandchildren aren’t viewed by Grandma and Grandpa as tots needing guidance and a lecture or three.

“The grandparent-grandchild relationship is less fraught,” said Dr. Gail Saltz, a clinical associate professor of psychiatry at the NewYork-Presbyterian Hospital/Weill Cornell Medical Center and host of the podcast “How Can I Help?”

“It’s different from a parent-child relationship, where it’s hard to move into the adult space. It’s hard for the parent not to parent, and young adults don’t want to be parented,” she said.

Grandchildren and grandparents have their own discrete needs. The grandchildren, still in school or in low-paying, entry-level jobs, are looking for deeply affordable housing with very tolerant landlords. The grandparents — not as young as they once were — may be contending with decreased mobility, health challenges and isolation.

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Not alone

“The idea of young adults living with grandparents really solves a lot of social issues,” said Rachel Margolis, an associate professor of sociology at the University of Western Ontario in Canada who studies the demography of grand-parenthood. “Most older adults want to age in place, and they need help to do so.”

June Iseman, 90, shares quarters on the Upper East Side with her granddaughter Ally Iseman. “My granddaughter moving in with me means I’m not alone,” she said. “Even though she sleeps until 11 and goes to work at noon, the fact is, she’s here. Because I’m not 100% OK in terms of my health, that’s a good thing.”

Of course, grand-mates didn’t exactly find each other through Craigslist. Those who choose this particular living arrangement have a long history and a close bond.

Because of family complications, Meghan Shiffer, 20, a college student, lived with her maternal grandmother, Mary Ingraham, for several years during her childhood. In December, when her mother died, Shiffer assessed her options and ultimately decided to move back into her grandmother’s house near Troy, New York, this time into a self-contained apartment on the second floor.

“I chose to do this because honestly my grandmother has always been one of my favorite people,” Shiffer said.

Stay for a few weeks

Adam Kantor was raised in Great Neck, New York, five minutes away from his paternal grandparents, Lucille and Martin. “My family was very close-knit, and I spent a lot of time at their house,” said Kantor, 36, an actor and singer whose Broadway credits include “Fiddler on the Roof” and “The Band’s Visit.” “Both of them, Lucille in particular, sparked my love of theater,” he said.

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In 2008, during his senior year of college, not long after his grandparents sold their house and moved to a co-op in the Sutton Place neighborhood of Manhattan, Kantor landed his first job on Broadway — a principal role in “Rent.”

“I got a sublet for a few months, and when the show closed I decided to stay on in New York for a bit,” he recalled. It just so happened that his grandparents had a small spare room with a Murphy bed behind the kitchen.

“I planned to stay for a few weeks, but it turned out to be a lot longer,” said Kantor, who, in between out-of-town jobs, was part of the household until 2016 when he bought a small studio apartment in the neighborhood. His grandfather died in 2013, and “it made me want to be more present for my grandmother,” Kantor said. “I’d take her to Central Park and we’d go to the theater together.”

Kantor began renting out the studio during the coronavirus pandemic, and recently joined forces with some friends to rent a house in Brooklyn. “I sublet my room because I’ve been doing some shows out of town,” Kantor said. He could have bunked in the house’s designated guest room, but instead chose to stay with his grandmother “because my relationship with her is so precious to me,” he said.

Traditions

Like David, Cassean Zuñiga realized that moving in with her grandparents would smooth the path to higher education. As a high school senior, she decided on the John Jay College of Criminal Justice. But she was looking at a two-hour commute if she continued to live with her parents in the far eastern edge of Queens.

Salvation came in the form of her maternal grandparents, Marciano and Aurora, who had a spare bedroom in their Long Island City, Queens, apartment — a mere 20 to 30-minute trip to campus.

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It would be a return to the familiar: Years earlier, Zuñiga, her parents and her grandparents, who immigrated from the Philippines, had shared a residence.

But the reunion was a bit bumpy.

Zuñiga’s grandparents still saw her as a little girl, she said. “The sun would set, and I would start getting texts and calls asking why I wasn’t home yet. They didn’t understand that college classes could go until 7, 8 or 9.”

Still, her grandparents had helped care for her during her childhood. She was not only there for a roof close to campus, but also, “I felt like it was my turn to take care of them,” said Zuñiga, who took on several housekeeping chores. “They would say, ‘We feel like you can protect us.’ That felt good.”

It also felt good to see her grandparents from a new — adult — vantage point.

“They would tell me stories about my great-aunts and uncles and their experiences coming to America,” Zuñiga said. “My grandfather had been an architect and he drew me a floor plan of a family house in the Philippines.” She went on: “In the years that I lived with them in their apartment, I knew him as a man who was quite forgetful and sat in front of the TV. But I was able to see that this was a person who had a full career and another life.”

For some grandchildren, moving in with grandparents is a hallowed family tradition. When Jessica Weiss graduated from Michigan State University in 2011, and moved into the three-level condo owned by her grandmother, Pat Hartsell, in suburban Detroit, she was greeted by a cousin who was just settling in. Eight other cousins had previously passed through. Once Weiss left Grandma’s place to rent an apartment with friends, she was succeeded by her younger brother, Jacob.

It was a good deal, if not exactly a free ride. “The arrangement was that we didn’t have to pay rent the first year. After that it was a few hundred dollars a month,” said Weiss, who was happy to ante up. “I think it really helped my grandmother to have the grandkids there,” she said. “She had eight children, and when my grandfather passed away I think it was the first time she’d ever been alone.

“I was the maid of honor at my cousin’s wedding,” added Weiss, now 33 and an advertising director. “And during my speech, I joked about our grandmother being our third roommate and about how she was the wild one.”