http://i.imgur.com/IuES0.jpg
I'm gonna believe that Yuuya is in his 20's. It makes a lot of sense since there's an age limit to drinking in America, but then again this is anime. The place where they could have a loli/kid character be a teacher in Academy City.
It would be a lot cooler having a male lead that isn't in his early/mid teens for a change. Rare Pokemon, it is.