Alexander Graham Bell was born in March of 1847 and died in August of 1922, making him 75 years old at the time of his death. Bell died in Canada from complications related to diabetes, according to science.ca.
The Encyclopaedia Britannica reports a number of milestones in Bell's life. He is most famous for the invention of the telephone in 1876 at age 29. He is also known for his contributions to the development of the phonograph in 1886 when he was 39.
Bell also developed a surgical probe designed to locate metal lodged in the body that was used during the Boer War and World War I. Bell was a teacher of the deaf and one of the founding members of the National Geographic Society in 1888.