Were Charles-Augustin de Coulomb and Napoleon alive at the same time?
Yes. Charles-Augustin de Coulomb and Napoleon were alive at the same time for 37 years, from 1769 to 1806.
Charles-Augustin de Coulomb was 33 when Napoleon was born.
Napoleon was 37 when Charles-Augustin de Coulomb died, aged 70.
Napoleon
French military leader, French Emperor 1804–1814 and again in 1815
Born 15 August 1769 · died 5 May 1821, aged 51