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Extracted from my ‘magic’
Pope Excel Spreadsheet.
Though we have a fairly accurate record of nearly all of the papacies in terms of start and end dates, this is definitely NOT the case when it comes to knowing the birthdates of the popes.
Nearly all of the birthdates of the popes elected prior to 1400 are either NOT known or reliable. Hence, we really can’t be definitive when it comes to talking about the real ages of popes prior to the 15th century. I have, however, made 4 exceptions BUT highlighted them with an orange background. In the case of these 4 popes we think we have a good handle as to how old they were when they died — but, it is true, that it is still supposition. I could have included Celestine III (#176) into this list too, but the ages that we have for him, i.e., that he was elected when he was about 85 years old and died 7 years later are even more sketchy. So I left him out. So, again, IF you want to be pedantic, exclude the 4 popes marked in orange and focus on the other 21.
In Chronological Order as to when they were pope.
In terms of oldest to youngest, i.e., Pope Francis.
How long they had been pope before they turned 80.