The oldest known person in the world has died at 118, far exceeding the United Nation's world life expectancy of 72.98 years. But living past 100 isn't the rarity it once was. Many exceed the milestone and live a century or more, including the 1 in 7 million Westerners estimated to live past the age of 110. Each of these centenarians and supercentenarians (more than 110 years) credits their extraordinary longevity to something different, including some colorful claims — healthy and otherwise — that may have little basis in science. Just remember to take their insights with a grain of salt, as researchers believe it's mostly a matter of genetics.