Depends on what you mean by disappear. From what I heard this took place in 3 AF, but in Serendipity which apparently is how Sazh(and Dajh) got to 500 AF. Or if by disappear you mean when Hope mentioned he hasn't seen Sazh in about 10 years since when you meet Hope 13 AF or 14 AF, can't remember which one the Massif was...blah blah blah, something about living a normal life with Dajh
How come that, in the 3 years since XIII nobody's physically aged (asides from the off-screen Hope) or bothered to change their clothes? Snow made an effort, but it's still top-notch laziness on Team NORA's part. Look at Serah in the opening scenes of New Bodhum, sleeping in her good clothes. She had to get a paradox to help her take off her bloody socks.
"I imagined many moons in the sky, lighting the way to freedom.'' - Cindi Mayweather http://s1136.photobucket.com/albums/n496/Elice_Carol/