Karl Marx · Sigrid Undset Were Karl Marx and Sigrid Undset alive at the same time? Yes. Karl Marx and Sigrid Undset were alive at the same time for 0 years, from 1882 to 1883. Karl Marx was 64 when Sigrid Undset was born.Sigrid Undset was under a year old when Karl Marx died, aged 64. Karl MarxGerman-born philosopherBorn 5 May 1818 · died 14 March 1883, aged 64Sigrid UndsetNorwegian writerBorn 20 May 1882 · died 10 June 1949, aged 67 NapoleonAbraham LincolnKarl MarxMahatma GandhiVladimir LeninAlbert EinsteinSigrid UndsetAdolf HitlerRonald ReaganDonald Trump Karl Marx and Sigrid Undset 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.