Paldo worked for over 80 years from ages 18 to 99, and she believes working was a big contributor to her longevity. "That kept me busy, and I enjoyed working," Paldo says about her former job. Paldo's family started a sign business in Chicago producing electric signs, and Paldo was in charge of office work. "And I was the only one in the office that did all of the office work for our business, so it was enjoyable. Milman is also involved with the SuperAgers Family Study, which aims to discover the biological factors that contribute to longevity.

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Persons: Madeline Paldo, Paldo, She'd, it's, Sofiya Milman, Milman Organizations: CNBC, Harvard, Institute for Aging Research, Albert Einstein College of Medicine Locations: Chicago, Texas