Were Antonie van Leeuwenhoek and Voltaire alive at the same time?
Yes. Antonie van Leeuwenhoek and Voltaire were alive at the same time for 28 years, from 1694 to 1723.
Antonie van Leeuwenhoek was 62 when Voltaire was born.
Voltaire was 28 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