Karl Marx · Miguel de Unamuno Were Karl Marx and Miguel de Unamuno alive at the same time? Yes. Karl Marx and Miguel de Unamuno were alive at the same time for 18 years, from 1864 to 1883. Karl Marx was 46 when Miguel de Unamuno was born.Miguel de Unamuno was 18 when Karl Marx died, aged 64. Karl MarxGerman-born philosopherBorn 5 May 1818 · died 14 March 1883, aged 64Miguel de UnamunoSpanish poetBorn 29 September 1864 · died 31 December 1936, aged 72 NapoleonAbraham LincolnKarl MarxMiguel de UnamunoMahatma GandhiVladimir LeninAlbert EinsteinAdolf HitlerRonald Reagan Karl Marx and Miguel de Unamuno 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.