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P.G. Wodehouse and Agatha Christie
The 20th-century British humorist was a prolific correspondent and became pen pals with crime writer Agatha Christie when he was 88 and she was 79. Although they were huge fans of each other's works, they often spoke of issues concerning their old age. Christie's final letter to Wodehouse ended with, "Goodbye for now and thanks for all the laughs." He died a month later.

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