Here is a link to a question asking about the youngest bishop ever.
Has there ever been an archbishop or bishop younger than the 16-year-old James of Nicosia?
There are many answers to the question, including one of mine.
Archbishops are a category of bishops, higher ranked bishops. Some but not all bishops are archbishops, but all archbishops are bishops. So the youngest bishop should be either the youngest archbishop or else younger than the youngest archbishop.
And now I ask the obvious related question about archbishops, since the youngest archbishop might be years older than the youngest bishop.
Who was the youngest archbishop ever?