Indeed, though if we assume that he could join the military fairly young, say in his mid-teens which wouldn't be terribly unheard of, his fathers influence could have lead to him being judge at a fairly young age, maybe as early as 17. If he didn't remain a judge for long then that'd leave time for him to become a reasonably successful sky pirate. I do agree just the same though that making him at least 25 instead would make it a bit easier to swallow for North American and European gamers.
As it is though, I don't really pay attention to characters ages when I'm playing unless they're explicitly stated in the game, so I just assumed he was in his late 20's at least.