John Maynard Keynes · Adolf Hitler Were John Maynard Keynes and Adolf Hitler alive at the same time? Yes. John Maynard Keynes and Adolf Hitler were alive at the same time for 56 years, from 1889 to 1945. John Maynard Keynes was 5 when Adolf Hitler was born.John Maynard Keynes was 61 when Adolf Hitler died, aged 56. John Maynard KeynesBritish economistBorn 5 June 1883 · died 21 April 1946, aged 62Adolf HitlerDictator of Germany from 1933 to 1945Born 20 April 1889 · died 30 April 1945, aged 56 Mahatma GandhiVladimir LeninAlbert EinsteinJohn Maynard KeynesAdolf HitlerRonald ReaganNelson Mandela John Maynard Keynes and Adolf Hitler in bold, with some of their best-known contemporaries. Drag across to see the age each reached in any year. Faded ends mark uncertain dates.