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

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

"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

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