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The Bobbsey Twins are the principal characters of what was, for 75 years, the Stratemeyer Syndicate's longest-running series of American children's novels, written under the pseudonym Laura Lee Hope. The first of 72 books was published in 1904, the last in 1979, with a separate series of 30 books published from 1987 through 1992. The books related the adventures of the children of the upper-middle-class Bobbsey family, which included two sets of fraternal twins: Bert and Nan, who were eight years old, and Flossie and Freddie, who were four when the first book was written. The two sets of twins aged as the series went on. As the series continued, the two sets of twins were perpetually aged at 12 and 6.