Reader's Input 1: How No One Ages in Pokemon

     This is the beginning of a new series of posts I'm doing while stalling for time on what Pokemon to do next. I really feel sad no one comments, so I'm seeing if the internet is muted or something by asking you, the readers, of your opinion.This is to see your theories, not mine.
     So, why is it no one seems to age? Or, in fact, why does no one die in the world of Pokemon? Ash Ketchum has been ten for longer than he should be, and he looks no different than he did four or five years ago, if he's not younger, he's the same. Pokemon are said to die, but no trainer has ever witnessed the death of a pokemon. If pokemon can die, why can't Misty? Or why is it that people like Team Rocket goons Jessie and James are so terrified of someone who can't do anything too scary to them because there is no concept of death? What goes on that makes it this way? Did Dialga just decide to stop aging people for the fun of it? Could Ash honestly be immortal, and it just seems that everyone around him ages slowly or nicely?                                                                   What do you think?