Morrie Markoff followed a mostly vegetarian diet, didn’t use plastic and didn’t have any neurological disorders like dementia or Alzheimer’s.

When he died at age 110, Morrie Markoff was the oldest man in the United States, but that’s not the only reason he was so remarkable.

At the time of his death on June 3, Markoff hadn’t suffered any cognitive decline from illnesses like dementia or Alzheimer’s disease, which are linked to aging.

“I didn’t think too much about it until he was dying,” his daughter, Judith Markoff Hansen, 83, shares. ”I woke up and I thought, ‘What’s going to happen to dad’s brain? This fabulous brain?’

She shared that her dad often joked he couldn’t donate his organs — “No one would want them because they were too old” — but she hadn’t thought about suggesting that he donate his brain before.

An online search led her to the Brain Donor Project, which facilitates the pairing of donated brains with researchers.

“Scientists believe this is the oldest cognitively healthy brain that’s ever been donated,” Tish Hevel, CEO of the Brain Donor Project, explains. “So, that’s quite a thing.”

Hansen pointed to her father’s healthy lifestyle, sharing that he and her mother, Betty, ate largely vegetarian meals, rarely drank alcohol, stayed active — and were constantly learning.

“He was just an incredibly curious person,” Hansen shares about her father, who was born in the Bronx but moved to Silver Lake, Calif., for work as a salesman and machinist. 

“He was very interested in science. He at one time subscribed to Scientific American and this is a man with an eighth grade education.”

She said that her father and late mother, who died at age 103, “walked three miles a day, late into their 90s. And I know that it was three miles a day because they went down their hill and then they walked around a lake. And you can’t cheat, you know, [when] you’re going around the lake.”

They ate very simply, she adds, “Never had any soda, no junk food at all. Even store-bought cookies were a little hard to come by.”

Hansen is also quick to point out that “mom shunned that whole fad of bottled water.” She continued, “They drank a lot of water but always from the tap,” explaining that her father trusted science — and trusted the routine testing of Los Angeles county’s water supply.

“She had an instinct about plastic,” Hansen says, sharing that when a recent study found that the average bottle of water contains 250,000 pieces of plastic, “My dad called me. He said, ‘J, mama was right. We were right. They should have listened to us.’”

He was also an artist, Hansen explains, “the story goes that he was fixing a toilet, he took a piece of the toilet, it looked like a ballerina’s dress on her skirt. And he made that into a sculpture.”

“He was just an incredibly creative person,” she shares about her father, who often posted his artwork and musings on his blog — which made him the oldest living blogger. “Hopefully the brain will find a large area of creativity. I don’t know what it’s going to find. It’s going to be interesting.”

That’s for certain: Hevel explains that “they’re hoping they can learn what allowed this man to live so long at such a high-functioning level, in case there are things that we can do.”

“Just for example, maybe there’s a certain kind of protein or enzyme that was more prevalent in his brain than most people. And then the next step would be, ‘How can we help other people experience that?’”

If you asked Markoff, however, Hansen says he would tell you the secret to living long is to “keep breathing” — the title of his memoir, which he published when he was 103.

“He always joked about the ‘keep breathing,’” Hansen recalls, adding that on a more serious note, her father would advise “be interested in things and walk a lot.”

And, she adds, “My mother would say, ‘Don’t drink bottles [of water].’”