There's a face Tidus makes when she mentions the age of the elves; his eyes pop, in that way when he has something to say, but he's listening, waiting on his turn. But he absolutely does have a few things to say about that!

"Yeah, yeah! When I first got here, I thought the thing was broken, making ages up! There's the ages it doesn't know and some names. But I had a friend when I first got here, he looked about my age, but I found out he was fifty!" Fifty, Madoka!