The problem is that we do not know the birthdates of all the early popes.
In essence, as you can see from my ‘Magic Papal Spreadsheet‘ we only started getting reliable birthdates for popes as of those born 1400 and later. Even then we have an exception. Hence, why all my famous ‘Oldest‘ and ‘Youngest‘ records when it comes to popes always carry the caveat ‘as of 1400‘.
Benedict XVI, if he had not resigned, would have been the 2nd oldest pope as of 1400.
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