I don't know if Vincent has Jenova's cells in him or not.. I mean, it's possible that Hojo found some other way to make Vincent imortal. Anyways, Vincent will age but his body will not show any affects of time. Got that? Ummmm... I didn't pay much attention on how Hojo made Vincent.. so I can't say all that much about him. Well, if Vincent has Jenova's cells then he'll obviously have GeoStigma in AC.