In 2018, 67 is the most common age for an American (U.S.) Clemens who is registered male with the Social Security Administration. It is the 12, 372nd most common male first name for living U.S. citizens.
― Anonymous User 10/19/2018
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Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://nossaistorgia.ch/entries/Y9JDKOKrDOR
https://nossaistorgia.ch/entries/lqYVyBbDeAG
https://www.portraitarchiv.ch/portrait?page=76
http://www.annalas.ch/persunas/display/q:Clemens