>>536020750
That may be not the case.
We thought Guda should be on his 20 because he was working in antartica at the beginning of the game.
But some of the maps actually confirmed that he wasn't really "hired" but that he was basically kidnapped. So Fujimaru may started the game as a teenager.

Still amusing how an organization that is fine with kidnapping, murdering, child laboring, assault and lot of other felonies is so adamant about respecting japanese drinking laws specifically