In past interviews with CNBC Make It and other publications, many centenarians credited their diet for living a long, healthy life. Elizabeth Francis, 115Elizabeth Francis, the oldest living person in the U.S. who is 115 years old, told ABC 13, that she eats "everything." Deborah Szekely, 102At 102 years old, Deborah Szekely still helps to run her fitness resort and spa three times a week. Lunch: Salad at home, she said, or lunch at restaurants. Her diet is very similar to the Mediterranean diet, and it includes fish, whole grains and fruits and vegetables.

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Persons: Elizabeth Francis, Francis, Ethel Harrison, TODAY.com, Harrison, Deborah Szekely, Szekely, Shirley Hodes, Hodes, Daisy McFadden Organizations: CNBC, ABC Locations: U.S