Because he's a fictional character. Fiction knows no laws that happen in real life.
Ok, Anime mechanics. Follow-up question to the one the topic asks. If Ash is still supposed to be ten, then why was he redesigned to look older in this Gen?
It's a cartoon -_- In cartoons characters never age.
He wasn't designed to look older, just redesigned. Some people even think he looks younger.
Anime characters don't age unless a timeskip happens at a certain point of the story, but since there were no timeskips in Pokemon: Ash's still 10.
Gohan aged gradually throughout the DBZ series. So that rule isn't always in place.
I guess the point I'm really trying to make here is, who in the Anime has actually said that he's still ten?
I've been wondering why has Ash remained ten throughout the series in general. Sure, most likely the writers didn't want to age him because they wanted him to stay young and untainted as a character. That way, they wouldn't screw with the younger audiences that way. Also, as I read online, it was for money.
I don't like that.
Come on, let's get creative with this. Maybe in the animeverse time passes slower? Let's discuss this here. PLEASE REMAIN APPROPRIATE. And yes, maybe if Ash ages, the universe will come to an end
So, yeah. Talk.
Source: http://www.serebiiforums.com/showth...amp-Conduct-*READ-BEFORE-POSTING*-Feb-19-2012 aka, the rules of the board.A. Ash is still ten. Misty is still ten. May is still ten. Dawn is still ten. If we are to believe the character profiles featured in a Japanese magazine many years ago, Brock is 15. The ages of other main characters have not been revealed.
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Also, the characters in this series are immune to aging. Some people will try to create their own fictional timeline of the series, often using such throwaway lines as Misty commenting on one year passing since they first arrived in Viridian City, or Ash throwing an anniversary party of first meeting Pikachu. These are throwaway details, not actually meant to have any weight behind them regarding the passage of time in the anime. Misty’s line was to convey nostalgia (plus, note that her comment was only in the dub dialogue), for instance. Others try to calculate the number of episodes as equivalent to a day or week passing, which is also false.
As a standard formula, memorize: “Time passes, but no one ages”. It’s weird, but it’s not like this is the only anime who uses it.