The Old World is a reference to those parts of Earth known to Europeans before the voyages of Christopher Columbus; it includes Europe, Asia and Africa.
Oh and just to make it crystal clear because with you one has to I stand by my comments.
Including the one
"Countries have their customs"
What part of that is difficult for you? or are you saying Hasidim of the Mea Sharim don't have any customs?
I have to say what their precise attitude to human waste is I don't know, but it is certainly different to yours, but I suspect that includes most people.