Re: Ash's Age
Now this is what really doesn't make sense in the anime. It said in the first Pokémon: Black & White episode that he's 10 years old. And just when you look back to the special that aired during Pokémon 3: The Movie, which was "Pikachu & Pichu", at the end of the special... Ash had a celebration of his first anniversary of when he first met Pikachu. And during the very first episode called Pokémon: I choose you! It was his birthday.
It's just a matter of fact that they've messed up in the anime department, simple as that. I think it's because they rush things rather than taking their time to finish it.
It's already been mentioned on some official source that Pokémon Black and Pokémon White's development time was very short, so they never got to be able to fix some problems with the designs and what impact it would do.