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From A Mathematician’s Apology, G. H. Hardy, 1940: "I had better say something here about this question of age, since it is particularly important for mathematicians. No mathematician should ever allow himself to forget that mathematics, more than any other art or science, is a young man's game. ... I do not know an instance of a major mathematical advance initiated by a man past fifty. If a man of mature age loses interest in and abandons mathematics, the loss is not likely to be very serious either for mathematics or for himself."

Have matters improved for the elderly mathematician? Please answer with major discoveries made by mathematicians past 50.

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Such questions are usually counted "community wiki". –  Wadim Zudilin May 23 '10 at 7:01
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Rmk: Hardy suffered of depression, and was living not exactly in the most suitable environment for that. Unfortunately, this wrong idea of "mathematics is a young man's game" had an incredible success. –  Pietro Majer May 23 '10 at 8:10
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Cliff Taubes (b. 1954) recently solved Weinstein conjecture, Gopal Prasad (b. 1945) has done multiple great things (separately with J-K. Yu, A. Rapinchuk, & S-K. Yeung) on buildings, Zariski-dense and arithmetic subgroups of ss groups over number fields, classification of "fake" projective spaces, etc., Serre turned 50 in 1976 (e.g., his precise modularity conjecture published in 1986 exerted vast influence over number theory ever since), and Jean-Marc Fontaine (b. 1944) is as dominant as ever in $p$-adic Hodge theory (e.g., Colmez-Fontaine thm. in 2000, recent work with L. Fargues, etc.) –  BCnrd May 23 '10 at 13:04
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This isn't exactly what you were asking for, but Littlewood himself, after overcoming depression at age 72, did good mathematics throughout his 80's--it's hardly a young man's game. –  paul Monsky Jun 1 '10 at 23:50
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Re "Littlewood himself": Of course it was well known that Littlewood was the name Hardy used to publish his lesser results (cf "A mathematician's miscellany"). –  Victor Protsak Jun 2 '10 at 0:09

37 Answers 37

Caspar Wessel, a surveyor born in 1745, presented his only math paper "Om Directionens analytiske Betegning" (in Danish) in 1797 at the age of fifty two on complex numbers. His paper was forgotten for almost 100 years until his paper was translated into french in 1878(?). In the meantime Gauss in 1831 and Argand in 1806 re discovered Wessel's idea.

By reading the texts in Complex Numbers you will hardly know the contributions Wessel.

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Interesting example, but I think the statement of Hardy is best understood for professional mathematicians (not that I agree with it, btw). –  Thierry Zell Feb 15 '11 at 16:49

The story with one's age is very simple : different persons can age very differently. If one takes care not to age in the wrong way for a given intellectual venture, then quite likely, one can pursue it for many decades ... And of course, mathematics is an intellectual venture ... A good example of how little physical condition is needed for pursuing an intellectual venture is given by the well known physicist Stephen Hawking ...

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By the way of mathematics, the Austrian mathematician Leopold Vietoris (4 June 1891 – 9 April 2002) has published papers till his last days. And after retirement, he published more than during his academic career. –  Elemer E Rosinger Jul 3 '10 at 13:05

Burnside proved the $p^aq^b$ theorem at age 53.

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Uncle Petros proved Goldbach's conjecture just minutes before his death, when he was more than sixty.

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Fourier (1768 - 1830) presented his work Théorie analytique de la chaleur in 1822 at age 54.

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Charles Sanders Peirce (born 1839) explicitly declared his Existential Graphs (all three parts: Alpha, Beta, and Gamma) to be his chef d'oeuvre. This work on graphical logic began sometime in the early 1880's, and he continued to work on it until his death in 1914.

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