> Mathematicians, a different breed entirely, had Leonhard Euler and Carl Friedrich Gauss who kept going until a very old age, for their times—76 and 77—despite starting very early, as mathematicians seem to do. This is not a universal trend: in the twentieth century, David Hilbert at 81 and André Weil at 92 are the only exemplars that come to mind.
What about Paul Erdős?