Board Thread:New on Sword Art Online Wiki/@comment-68.56.145.104-20150420231546/@comment-77.23.155.45-20160204213454

If Argo got a work already (and assuming this isn't a part-time job) then she has already graduated middle-school (which is compulsory in Japan) and more than likely high school (more than 90% middle graduates enter high school). Which pegs her as at least 18.