Isaac Newton · every age

What was Isaac Newton doing at 68?

Invented calculus and gravity theory in a plague year at 23

1. c. 1711

   Royal Society report named him calculus's true discoverer

   It called Leibniz a fraud; Newton had written its conclusion himself.

   Source: en.wikipedia.org

Portrait: Portrait: Godfrey Kneller (1689), public domain, via Wikimedia Commons · source