[ And as confusing as it sounds, when she explains it to him, Genos finds a way to follow the train of thought. It requires him to do a bit of abstract thinking but he really doesn't think it's too terrible. ]

Then, in a way, you are born whenever your country is first founded and then stop aging once it's reached its peak of development. Is something like that correct?

[ TBH, he never thought he would ever meet a country. This sort of gives the terms "exploring new lands" a whole new meaning. ]

I believe then that could be explained by scientific theories, such as multiverses. Granted, I suppose they are no longer exact theories by strict definition.