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How old was Thomas Edison when they demonstrated the first practical incandescent lightbulb?
Thomas Edison was 32 years old when they demonstrated the first practical incandescent lightbulb, on 21 October 1879.
Thomas Edison died 18 October 1931 at age 84 — 52 years after this milestone.
Thomas Alva Edison was an American inventor and businessman known for his work on the incandescent light bulb, the phonograph, electric power distribution and early motion pictures. The merger of the Edison General Electric Company and the competitor Thomson-Houston Electric Company resulted in the formation of General Electric. Edison registered 1,093 patents in the United States.
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Other people who hit a milestone around age 32.