Earlier quoted context omitted.
Expect that Pokemon has done the exact opposite: it deliberately has not upped the age of the target audience of the core product. Ash is still ten years old, after adventuring for 20 years. And he's still "relatively unexperienced". Time doesn't pass. Pokemon has diversified the franchise selection though, there are now many goods (themed tableware etc.) aimed for more mature audience.
I've seen at least 3 or 4 posts to the tune of "I'm 23, and I just can't get into this latest Pokemon game. It's so easy, not like they used to be! Am I a bad person?" If you value your karma score, on no account should you say anything like "It's OK, Pokemon is a game designed for children, and while that doesn't mean you must now make an angry face at it, growl, and loudly announce that you're too grown up for it n…
I think the later games make more concessions to them, but it feels more like it was just a normal rpg that somehow got big for kids due to ancillary merchandise, like trading card games and cartoons.