I've wonder if Ash have gone thru puberty or not...
At the beginning of the series, Ash Ketchum was 10 years old,
and later, in the episode "The Battle Of The Badge", Ash said that
it was a whole year since he and Pikachu had visited Viridian City,
making him 11. Furthermore, in the short called "Pikachu &
Pichu" which was attached to Pokémon 3: The Movie, he said
the day when the events depicted in the short took place was the
anniversary of the day he met Pikachu, meaning his age at that time
would be at least 12. However, two seasons later, Pokeani reported
that Ash was the same age as May, who was 10 years old at the time.
This and the fact that the two are at the same height suggests that
both of the characters are the same age.
