Five. The Mandalorian Wars ended five years before KotOR. The Dark Wars, the one that happens in KotOR 2, is five years after that, spanning from when Malak dies until Traya dies. The game just has a bunch of older men call him young, without giving an exact age. Revan's always been older, there was even a comic he played a role in I believe, before that novel was released. Him being in his late thirties is believable, if not required.
Those ages are in the book. Whether you like them or not, that's canon.
Fair enough, 5 then -- It's been a while since I played the first one, I admit that. Anyway it only adds to my point though rather than subtracting from it. I don't see any actual sources here to back up your arguments for his age beyond your own claims and speculations. I mean, that's fine, if that suits you anyway.
As for the ages in the books -- If it fits for Drew Karpyshyn, just as much as the name he chose to grant to the Exile, then that's great but since it's not part of the game, and Drew definitely had nothing to do with its development, then it is about as canon, and relevant, as anything else outside of the movies.
No the Exile's age isn't specified in game, but consider the Exile is definitely younger than Revan, was a Padawan when the Mandalorian Wars began
Nope, she was a Jedi Knight when the Mandalorian Wars began, in fact she was about to be chosen as the Disciple's Master before she decided to join the war. Her age isn't specified beyond wild speculation, such as yours.
Exar Kun died in 3996. KotOR takes place in 3956. Unless Atris is secretly in her late 70s, she hasn't been a historian since the end of the Exar Kun War. And she's not in her late 70's, in case her face didn't give it away.
I'll be fair here to say I retract my previous statement and change it to "After the end of the war with Exar Kun".
In regards to her face, you have to consider the fact that KOTOR is an old game, and portraying the precise age on said character's faces with such models at the time is hard.
I'm wondering if you actually played the game at this point, but yeah. I'm playing it right now.
Calm your ******, son -- I edited my post.. just not quick enough

Anyway, I think I've played KOTOR 2 so many times at this point that I've come to memorize a lot of the little details about it.