How long did doctor Watson Live?

Doctor John Watson, the fictional character created by Sir Arthur Conan Doyle, is not assigned a specific lifespan in the stories. However, he is typically depicted as being in his late twenties or early thirties during his first appearance in "A Study in Scarlet," published in 1887. The timeline of the stories suggests he would have lived into the early to mid-20th century, but exact details about his lifespan are left ambiguous by the author.