At what age did Thomas Edison die?

Thomas Edison died at age 84.

He was born on February 11, 1847, and died on October 18, 1931, at his home in West Orange, New Jersey. Because his birthday had occurred earlier that year, he was 84 years old at the time of his death.

Edison’s final years followed a career spanning telegraphy, recorded sound, electric lighting, batteries, cement, and motion pictures. He continued working at his West Orange laboratory complex late in life, although his health declined during his final months.

Some summaries give only the birth and death years, 1847 and 1931, and readers may calculate his age incorrectly by subtracting the years without checking the calendar dates. The correct age is 84, not 85, because Edison died nearly four months before his next birthday. His death was widely reported internationally, and memorial observances included dimmed lights in parts of the United States.