Photograph by Takuya Yoshino, Yomiuri Shimbun/AP

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Jiroemon Kimura, who died this week, is seen in December 2012.

Photograph by Takuya Yoshino, Yomiuri Shimbun/AP

World's Oldest Person Dies—How Can You Live to 100?

For starters, eat nuts and socialize, says longevity expert Dan Buettner.

The oldest man ever known to have lived—Japan's Jiroemon Kimura—died Wednesday at 116. Kimura, who was born April 19, 1897, was recognized by Guinness World Records as the oldest living person, oldest living man, and oldest man ever.

"As the only man to have ever lived for 116 years—and the oldest man whose age has been fully authenticated—he has a truly special place in world history," Craig Glenday, editor-in-chief of Guinness World Records, said on its website.

Misao Okawa, 115, of Osaka, Japan, now holds the title of oldest living person, as well as oldest living woman.

Though most of us won't make it to 116, National Geographic Fellow and longevity expert Dan Buettner has discovered tips on reaching old age through his work on blue zones—pockets of longevity around the world.

In his second edition of his book The Blue Zones, Buettner writes about a newly identified Blue Zone: the Greek island of Ikaria (map)National Geographic magazine Editor at Large Cathy Newman interviewed him in December about the art of living long and well. (Watch Buettner talk about how to live to a hundred.)

Q. You've written about Blue Zones in Sardinia, Italy; Loma Linda, California; Nicoa, Costa Rica; and Okinawa, Japan. How did you find your way to Ikaria?

A. Michel Poulain, a demographer on the project, and I are always on the lookout for new Blue Zones. This one popped up in 2008. We got a lead from a Greek foundation looking for biological markers in aging people. The census data showed clusters of villages there with a striking proportion of people 85 or older. (Also see blog: "Secrets of the Happiest Places on Earth.")

In the course of your quest you've been introduced to remarkable individuals like 100-year-old Marge Jetton of Loma Linda, California, who starts the day with a mile-long [0.6-kilometer] walk, 6 to 8 miles [10 to 13 kilometers] on a stationary bike, and weight lifting. Who is the most memorable Blue Zoner you've met?

Without question it's Stamatis Moraitis, who lives in Ikaria. I believe he's 102. He's famous for partying. He makes 400 liters [100 gallons] of wine from his vineyards each year, which he drinks with his friends. His house is the social hot spot of the island. (See "Longevity Genes Found; Predict Chances of Reaching 100.")

He's also the Ikarian who emigrated to the United States, was diagnosed with lung cancer in his 60s, given less then a year to live, and who returned to Ikaria to die. Instead, he recovered.

Yes, he never went through chemotherapy or treatment. He just moved back to Ikaria.

Did anyone figure out how he survived?

Nope. He told me he returned to the U.S. ten years after he left to see if the American doctors could explain it. I asked him what happened. "My doctors were all dead," he said.

One of the common factors that seem to link all Blue Zone people you've spoken with is a life of hard work—and sometimes hardship. Your thoughts?

I think we live in a culture that relentlessly pursues comfort. Ease is related to disease. We shouldn't always be fleeing hardship. Hardship also brings people together. We should welcome it.

Sounds like another version of the fable of the grasshopper and the ant?

You rarely get satisfaction sitting in an easy chair. If you work in a garden on the other hand, and it yields beautiful tomatoes, that's a good feeling.

Can you talk about diet? Not all of us have access to goat milk, for example, which you say is typically part of an Ikarian breakfast.

There is nothing exotic about their diet, which is a version of a Mediterranean diet, which emphasizes vegetables, beans, fruit, olive oil, and moderate amounts of alcohol. (Read more about Buettner's work in Ikaria in National Geographic Adventure.)

All things in moderation?

Not all things. Socializing is something we should not do in moderation. The happiest Americans socialize six hours a day.

The people you hang out with help you hang on to life?

Yes, you have to pay attention to your friends. Health habits are contagious. Hanging out with unhappy people who drink and smoke is hazardous to your health.

So how has what you've learned influenced your own lifestyle?

One of the big things I've learned is that there's an advantage to regular low-intensity activity. My previous life was setting records on my bike. [Buettner holds three world records in distance cycling.] Now I use my bike to commute. I only eat meat once a week, and I always keep nuts in my office: Those who eat nuts live two to three more years than those who don't.

You also write about having a purpose in life.

Purpose is huge. I know exactly what my values are and what I love to do. That's worth additional years right there. I say no to a lot of stuff that would be easy money but deviates from my meaning of life.

The Japanese you met in Okinawa have a word for that?

Yes. Ikigai: "The reason for which I wake in the morning."

Do you have a non-longevity-enhancing guilty pleasure?

Tequila is my weakness.

And how long would you like to live?

I'd like to live to be 200.