Sarah DeRemer Knauss was an American supercentenarian. She is the oldest person ever from the United States and, on April 16, 1998, became the world's oldest living person. She is the third-oldest verified person ever, living to the age of 119 years and 97 days. Her birthdate has been independently verified through numerous census and other records.

Longevity may refer to especially long-lived members of a population, whereas life expectancy is defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year.