Were Georges-Louis Leclerc, Comte de Buffon and Napoleon alive at the same time?
Yes. Georges-Louis Leclerc, Comte de Buffon and Napoleon were alive at the same time for 18 years, from 1769 to 1788.
Georges-Louis Leclerc, Comte de Buffon was 61 when Napoleon was born.
Napoleon was 18 when Georges-Louis Leclerc, Comte de Buffon died, aged 80.
Georges-Louis Leclerc, Comte de Buffon
French natural historian
Born 7 September 1707 · died 15 April 1788, aged 80
Napoleon
French military leader, French Emperor 1804–1814 and again in 1815
Born 15 August 1769 · died 5 May 1821, aged 51