Amedeo Avogadro · Karl Marx Were Amedeo Avogadro and Karl Marx alive at the same time? Yes. Amedeo Avogadro and Karl Marx were alive at the same time for 38 years, from 1818 to 1856. Amedeo Avogadro was 41 when Karl Marx was born.Karl Marx was 38 when Amedeo Avogadro died, aged 79. Amedeo AvogadroItalian scientistBorn 9 August 1776 · died 9 July 1856, aged 79Karl MarxGerman-born philosopherBorn 5 May 1818 · died 14 March 1883, aged 64 NapoleonAmedeo AvogadroAbraham LincolnCharles DarwinKarl MarxLeo TolstoyMahatma GandhiVladimir LeninAlbert Einstein Amedeo Avogadro and Karl Marx 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.