Were Alexis de Tocqueville and Karl Marx alive at the same time?
Yes. Alexis de Tocqueville and Karl Marx were alive at the same time for 40 years, from 1818 to 1859.
Alexis de Tocqueville was 12 when Karl Marx was born.
Karl Marx was 40 when Alexis de Tocqueville died, aged 53.
Alexis de Tocqueville
French political thinker and historian, minister of Foreign Affairs
Born 29 July 1805 · died 16 April 1859, aged 53