Dr. Seuss's first book was And to Think That I Saw it On Mulberry Street. According to an internet search, Seuss completed the manuscript in 1936 and submitted it to over 20 publishers during the winter of 1936-37 before it was finally accepted and published on December 21, 1937.
Dr. Seuss was born March 4, 1904. So you could say he was 32 years old when he wrote his first book and was 33 years 9 months and 19 days old when it was published.
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