No, he is the same age he was at the beginning of the show, the sohw doesn't even think about ages.

Expalin How In the Short In Tghe 3rd Movie It Was Pikachu and Ash's 1 YEAR ANIVERSERY

So they were together one year, big deal, that doesn't have anything to do with their ages now

Yes it does. Look the corse of the Pokemon seris is about over a year.

That was one series. Any series could take ten years for all we know

Look in the 4kids dub of Yugioh they said that the event between ep 1 and 224 are 4 years which is wrong becase it was only about a year. So in pokemon 4kids has a flop there with how old Satoshi and his friends are. Anyways each episode of Pokemon is one day so in japan it's about over 300 so it has to be about a year that has passed in their time line.