According to Wikipedia: \"The Bobbsey Twins are the principal characters of what was, for many years, the Stratemeyer Syndicate\'s longest-running series of children\'s novels, penned under the pseudonym Laura Lee Hope. The first of 72 books was published in 1904, the last in 1979. The books related the adventures of the children of the middle-class Bobbsey family, which included two sets of fraternal twins: Bert and Nan, who were 12 years old, and Flossie and Freddie, who were six... In the original editions, the first books in the series (like those in previous Stratemeyer series) took place in a clear chronology, with the characters aging as time passed. The Bobbsey Twins: Merry Days Indoors and Out took place over the course of a school year, with Nan and Bert described as eight years old and Freddie and Flossie four; the second book, The Bobbsey Twins in the Country is set the following summer. The second part of the summer is chronicled in The Bobbsey Twins at the Seashore, which is written as a direct sequel to the previous book, tying up some plot threads. The fourth book, The Bobbsey Twins at School, begins the next autumn, with Nan and Bert \"nearly nine years old\" and Freddie and Flossie \"almost five.\" Editors at the Stratemeyer Syndicate quickly realized that at this rate their young heroes would quickly age beyond their readership, and so the later books in the series (and in all revised editions) take place in a sort of chronological stasis, with the older twins perpetually 12 years old and the younger set 6.\"
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