Frederick Butterfield

Frederick Victor Butterfield (28 February 1864 – 9 March 1974) of Harrogate, England became the world's oldest man on 5 May 1973 after the death of Friedrich Wedeking. Born at Thirsk, he qualified as a chemist in 1885 after training for five years. He retired from pharmacy at the age of 99, according to the 1974 Guinness World Records. An electroencephalogram was performed on Butterfield before his death. The doctors concluded that his brain activity was comparable to a healthy person aged 70–75.