Sigrid Undset · Adolf Hitler Were Sigrid Undset and Adolf Hitler alive at the same time? Yes. Sigrid Undset and Adolf Hitler were alive at the same time for 56 years, from 1889 to 1945. Sigrid Undset was 6 when Adolf Hitler was born.Sigrid Undset was 62 when Adolf Hitler died, aged 56. Sigrid UndsetNorwegian writerBorn 20 May 1882 · died 10 June 1949, aged 67Adolf HitlerDictator of Germany from 1933 to 1945Born 20 April 1889 · died 30 April 1945, aged 56 Karl MarxMahatma GandhiVladimir LeninAlbert EinsteinSigrid UndsetAdolf HitlerRonald ReaganNelson MandelaDonald Trump Sigrid Undset 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.