Were Isaac Newton and David Hume alive at the same time?
Yes. Isaac Newton and David Hume were alive at the same time for 15 years, from 1711 to 1727.
Isaac Newton was 68 when David Hume was born.
David Hume was 15 when Isaac Newton died, aged 84.
Isaac Newton
English mathematician and physicist
Born 25 December 1642 (Julian calendar) · died 20 March 1727 (Julian calendar), aged 84
David Hume
Scottish philosopher, economist, and historian
Born 26 April 1711 (Julian calendar) · died 25 August 1776, aged 65