Were Isabelle de Charrière and Napoleon alive at the same time?
Yes. Isabelle de Charrière and Napoleon were alive at the same time for 36 years, from 1769 to 1805.
Isabelle de Charrière was 28 when Napoleon was born.
Napoleon was 36 when Isabelle de Charrière died, aged 65.
Isabelle de Charrière
Dutch French-language writer and composer
Born 20 October 1740 · died 27 December 1805, aged 65
Napoleon
French military leader, French Emperor 1804–1814 and again in 1815
Born 15 August 1769 · died 5 May 1821, aged 51