Originally Posted by Ninja Bulbasaur
Ok, so a couple things to point out; 1. it was only the narrator who stated Ash's "age". 2. More importantly, Ash's maturity and skill level changed drastically, moreso than any other region. Therefore, despite references to past Sinnoh adventures via Dawn and Cynthia, the Unova saga can be interpreted as an alternate reality. Furthermore, I'm inclined to believe that people in the Pokemon world do indeed age slower, or at least remain in a youthful state for an undetermined period of time. This appearance does not affect their ability to mature mentally.
I support Save Our Voice Actors, a Pokemon fan group in favor of returning the voice actors in the anime dubbed by 4Kids (seasons 1-8). facebook.com/saveourvoiceactors