There's also https://en.wikipedia.org/wiki/Pope_Benedict_IX https://en.wikipedia.org/wiki/Pope_Benedict_IX : > Aged approximately 20 at his first election, he

There's also https://en.wikipedia.org/wiki/Pope_Benedict_IX https://en.wikipedia.org/wiki/Pope_Benedict_IX : > Aged approximately 20 at his first election, he is one of the youngest popes in history. He is the only man to have been Pope on more than one occasion and the only man ever to have sold the papacy.