Just finished game, I have a few questions **MAJOR SPOILERS**

Why would Quark have aged? You act like he was present 45 years ago. The only characters that were are Junpei, Clover, Alice and Akane. Junpei and Akane aged while Clover and Alice didn't because Clover and Alice were put into cold sleep to prevent that. Quark was found as a baby by Junpei prior to the beginning of this game, 10 years prior if memory serves.

Also, Junpei is here because Akane and Sigma needed other espers to amplify Sigma and Phi's powers. Junpei and Akane were the most powerful ones of which we knew, at least until Sigma and Phi appeared, so it makes sense that they would recruit him for this purpose.