There is absolutely no time travel in FFX. You may need to replay the game and note the finer details of the plot...Originally Posted by thinking of names is hard
At the end of FFX, he disappeared and went to the Farplane. It's fair to assume that he didn't age during this time (what with being an incorporeal spirit), so when he was 'recreated' two years later, he'd still be his 17-year-old self. This puts him two years behind Yuna, but who's counting?
