The earliest example of this quotation is found in Jules Claretie's Portraits Contemporains (1875), where the following remark is ascribed to lawyer and academic Anselme Polycarpe Batbie: "Celui qui n’est pas républicain à vingt ans fait douter de la générosité de son âme; mais celui qui, après trente ans, persévère, fait douter de la rectitude de son esprit" (English: "He who is not a republican at twenty compels one to doubt the generosity of his heart; but he who, after thirty, persists, compels one to doubt the soundness of his mind"). <br class="br">According to research http://www.webcitation.org/query?id=1256577474900567&url=www.geocities.com/Athens/5952/unquote.html by Mark T. Shirey, citing Nice Guys Finish Seventh: False Phrases, Spurious Sayings, and Familiar Misquotations by Ralph Keyes, 1992, this quote was first uttered by mid-nineteenth century French historian and statesman François Guizot when he observed, Not to be a republican at 20 is proof of want of heart; to be one at 30 is proof of want of head. (N'être pas républicain à vingt ans est preuve d'un manque de cœur ; l'être après trente ans est preuve d'un manque de tête.) However, this ascription is based in an entry in Benham’s Book of Quotations Proverbs and Household Words (1936): the original place where Guizot said this has not been located. This quote has been attributed variously to George Bernard Shaw, Benjamin Disraeli, Otto von Bismarck, and others. <br class="br">Furthermore, the Churchill Centre http://www.winstonchurchill.org, on its Falsely Attributed Quotations http://www.winstonchurchill.org/resources/quotations/quotes-falsely-attributed page, states "there is no record of anyone hearing Churchill say this." Paul Addison of Edinburgh University is quoted as stating: "Surely Churchill can't have used the words attributed to him. He'd been a Conservative at 15 and a Liberal at 35! And would he have talked so disrespectfully of Clemmie, who is generally thought to have been a lifelong Liberal?" <br class="br">Variants: Any man who is under 30, and is not a liberal, has no heart; and any man who is over 30, and is not a conservative, has no brains.<br>Show me a young conservative and I'll show you someone with no heart. Show me an old liberal and I'll show you someone with no brains.<br>If you are not a socialist by the time you are 25, you have no heart. If you are still a socialist by the time you are 35, you have no head. <br class="br">Misattributed <br class="br">Source: https://books.google.com/books?id=nIuaBX8moLkC&q=%22fait+douter%22#v=snippet&q=%22fait%20douter%22&f=false <br class="br">Source: http://quoteinvestigator.com/2014/02/24/heart-head/