About the high school setting, I do agree it's being oveused these days. Life isn't all about youth. Eternal Punishment is one of my favorite stories for focusing on adult life and showing the exact theme through the characters; Tatsuya asking Baofu about if adult life is difficult and later Baofu telling him that it's nothing to worry about as long he makes the few good things of it the most. I do enjoy P3 and P4 and will certainly enjoy P5 but at least another main title centering on college life would be nice. I also am going through adult life, it is difficult but I will try my best to make the most of it.
Off-topic for a moment, I am currently writing a novel story that focuses on a (Japanese) teenager's life after high school and hope for it to be a big hit as my dream career. If anyone interested in the story, PM me.