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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Clemens (1739-1812) was the son of Augustus III of Poland and his wife Maria Josepha.
I used to think of this name as really old-fashioned and too, well, Roman, but recently I met a 8-year-old boy named Clemens and it actually fits him quite well. I like the meaning as well (according to my Latin dictionary "Clemens" means "gentle" - a very big awww).
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