Frankensteinis one of the world's most famous horror stories. It's about a doctor who creates a new man from the body parts of dead people and brings it to life. But the experiment goes wrong and the monster  kills the doctor and many others. The story has been read by millions since it was first published and in the last hundred years it has been made into dozens of movies. Many people are surprised to learn its writer was a 19-year-old woman, called Mary Shelley. Mary was born into a rich London family in August 1797. She was educated by her parents and when she was 13 she decided to become a writer. In 1812, she met the famous writer Percy Shelley and they soon got married. Sadly for Mary, their first child died soon after birth in Italy. In her diary, Mary wrote about a dream:"I dreamt that my little baby came to life again---that it had only been cold and that we rubbed it before the fire and it lived." In 1816, Percy Shelley and 19-year-old Mary visited the poet Lord Byron at his home in Switzerland. Because of the bad weather they stayed indoors reading horror stories. On night, Byron asked everyone to write their own story. Mary thought of her dream and wrote the story ofFrankenstein Frankensteinwas published when Mary was 21, and became a huge success. Many people didn't think a 19-year-old woman could write so well and believed her husband was the real writer. Although famous, Shelley's life was full of sadness. Only one of her four children lived and in 1822 her husband died in a swimming accident. Mary was broken-hearted and decided not to marry again. She devoted herself to her child and continued to write until her death in 1851. How old was Mary Shelley when she died?
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