Galileo Galilei · Pierre de Fermat Were Galileo Galilei and Pierre de Fermat alive at the same time? Yes. Galileo Galilei and Pierre de Fermat were alive at the same time for 34 or 35 years, from 1607 to 1642. Galileo Galilei was 42 or 43 when Pierre de Fermat was born.Pierre de Fermat was 34 or 35 when Galileo Galilei died, aged 77. Galileo GalileiItalian polymathBorn 15 February 1564 · died 8 January 1642, aged 77Pierre de FermatFrench mathematician and lawyerBorn 1607 · died 12 January 1665, aged 57 or 58 MichelangeloMiguel de CervantesGalileo GalileiWilliam ShakespeareRené DescartesPierre de FermatMolièreIsaac Newton Galileo Galilei and Pierre de Fermat 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.