/lurks in this topic
The creators conformed in an interview that Satoshi would not and has not gotten any older than he was when the series started. This leads me to believe that he is 10 or 11 still, depending on if you count the movies as AUs (which is entirely possible as the only relations from movies to the anime episodes is the ability for Satoshi to use Hadou, which was in Movie 8, but also in the Sumomo episodes). Other than that, the movies have never been referenced in the anime, and no concept of time, other than time of day, has ever been used in the anime.