Which author-character relationship holds the record for the longest-running continuous literary series by the original creator, spanning over 50 years of publication?

In the publishing world, authors who create beloved characters often develop significant 'brand loyalty' among readers. Some character franchises become so successful that they continue for decades, with readers eagerly awaiting each new installment. This poll tests your knowledge about one of the most remarkable examples of sustained literary brand loyalty in publishing history.

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Agatha Christie's Hercule Poirot (1920-1975)
Ian Fleming's James Bond (1953-1964)
P.G. Wodehouse's Jeeves (1915-1974)
Arthur Conan Doyle's Sherlock Holmes (1887-1927)