Were Louis XV of France and Napoleon alive at the same time?
Yes. Louis XV of France and Napoleon were alive at the same time for 4 years, from 1769 to 1774.
Louis XV of France was 59 when Napoleon was born.
Napoleon was 4 when Louis XV of France died, aged 64.
Louis XV of France
King of France and Navarre 1715 to 1774
Born 15 February 1710 · died 10 May 1774, aged 64
Napoleon
French military leader, French Emperor 1804–1814 and again in 1815
Born 15 August 1769 · died 5 May 1821, aged 51