Which line: in Japan the line seems to be "real vs imaginary", in the US it seems to be "<18 vs 18+", which to me sounds more like a thought police. Much like t

Which line: in Japan the line seems to be "real vs imaginary", in the US it seems to be "<18 vs 18+", which to me sounds more like a thought police. Much like the infamous "I'll know it when I see it".