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Sir Walter, with his 61 years of life, although he never wrote a novel until he was over 40, had, fortunately for the world, a longer working career than most of his brethren.

Sir Arthur Conan Doyle (2013). “Delphi Complete Works of Sir Arthur Conan Doyle (Illustrated)”, p.8381, Delphi Classics
Sir Walter, with his 61 years of life, although he never wrote a novel until he was over 40, had, fortunately for the world, a longer working career than most of his brethren.