How old are each of the main characters in lore?

[Fenral]

Trying not to take your stuff too far out of context, but there are a couple points I have to object to:

The WoL worked with him during the Crystal Tower questline for all of 1 or 2 hours.

The Crystal Tower storyline ran from 2.1 to 2.5. In real-world time, he was in Mor Dhona for about a year-and-a-half. His role was ambiguous, but his design was distinct enough, and certain rules like "raids are tangential to canon" had yet to be firmly established (thanks to the Binding Coil being hard canon), so plenty of people had plenty of time to draw their own conclusions before he was unceremoniously stuffed in a box for five years. We now know that all of this was intentional, and that he was being saved for a potential second reboot, but at the time it was a lot to process.

G'raha Tia is just the same character as Alphinaud.

He's not, though. It's possible he was originally meant to replace Alphi in the event of the aforementioned second reboot, but for now he's actually around to reinforce Alphinaud as a character. He's still distinguished by his fatalistic streak, but if you talk to him between quest objectives, you'll realize he's mostly hanging around to shill Alphi as the true protagonist. If I'm reading the cards right, though, that probably won't be for much longer, and we already know which of them is in the Endwalker teaser.

Oh, oops, I double posted.