User blog comment:Godisme/Everything But The Rain Op. 2 "The Rudiments"/@comment-1393830-20130306172253/@comment-1351982-20130306182854

Yeah here he looks like he's in his mid twenties to early 30s and in the present time he looks like he's in his late 30s to early 40s. In the unofficial timeline Bleach the present storyline takes place in May or June 2003. So if Isshin lost his powers about 22 years prior to the current storyline, the flashback would take place around 1978-1979 in the Bleach universe, so since it has been confirmed by pretty much every translation of 528 than Isshin was human when he had Misaki conceived Ichigo, if he truely became human, then having him age to his current state is logical. Plus I wonder if Xcution has any ties to what's going on in the flashback since the shinigami were killed in Naruki City.