This isn't true. The majority of countries are much younger than this. The thousand year old ones are the exceptions.
Many countries have an 'origin story' which implies that they are the same thing as random countries or regions which had similar names/languages/locations but in the vast majority cases these are something between a loose approximation and a myth.
Many countries have an 'origin story' which implies that they are the same thing as random countries or regions which had similar names/languages/locations but in the vast majority cases these are something between a loose approximation and a myth.