um... so they all state or imply ages at some point during the story but since we're coming to the end of a semester or year, you could imply an extra year if you wanted. But canonically Braden is 18, Zack is 19, Mikhail is 19 and you could assume that Ash is probably 19 or maybe 20... him and Mikhail are pretty close in my head tho. Although Cody is pretty popular with the fanboys, I've never actually given him an age in game.