Greyjoy Ages Post, Attempting To Be Objective

A lot of people really bravely try to make sense of one of the many parts of asoiaf where GRRM didn't even try to account for the linear passage of time. I generally tend to disagree with at least one of the conclusion, however, hence my idea to make a post with just every information we have, as reference for people to draw their own, just as a fun challenge to myself, since I'm very aware there isn't a canon truth George intended to be gleaned here. Special thanks to whoever started A Search Of Ice And Fire or I would have died halfway through this