They've found it - in Sardinia:

In fact, researchers have detailed an astonishing longevity hot spot in which they have documented 90 centenarians among a population of 18,000. That means that one out of every 200 people in Ogliastra has lived to celebrate a 100th birthday. It’s an extraordinary figure, about 50 times the rate of the United States, where only one person out of every 10,000 people lives to see 100.

“These are people who not only have a very long life, but they are healthy up to a very old age,” says Luigi Ferrucci, chief researcher of longitudinal studies at the U.S. National Institute on Aging (NIA) and a co-author of the Ogliastra study. “These are not people who’ve gotten diseased or dementia at 70 years old and somehow lived another 30 years.”