no...I believe tidus is 17 and yuna is 19 in x-2, umm, tidus wasnt THERE for two years, he was just a incorporal spirit like Big D said. He had no body to age with, and no memory of the next two years.
and we've alreadyy had a LONG discussion on how auron aged; here are the theories:
1.if you die and arent sent, you still age if you are still human
2.well, you dont age when youre dead but since he lived in the dream
world for 10 years and the dream world is opposite from the real world, maybe the dead age there?
3.he just plainly allowed himself to age to not seem dead
4.The fayth knew of what he was doing so they tried to help him by aging him in the dream world.