Were Antonie van Leeuwenhoek and Isaac Newton alive at the same time?
Yes. Antonie van Leeuwenhoek and Isaac Newton were alive at the same time for 80 years, from 1642 to 1723.
Antonie van Leeuwenhoek was 10 when Isaac Newton was born.
Isaac Newton was 80 when Antonie van Leeuwenhoek died, aged 90.
Antonie van Leeuwenhoek
Dutch scientist known as "the Father of Microbiology", and one of the first microscopists
Born 24 October 1632 · died 26 August 1723, aged 90
Isaac Newton
English mathematician and physicist
Born 25 December 1642 (Julian calendar) · died 20 March 1727 (Julian calendar), aged 84