What country are you from young man?
- I'm from Englad.
So, in this sentence, do we any article like "the young man" or "a young man"? By logic i think we must use "the young man". But i hesitate because in the same book, i saw an example, like:
Hi, old man! How are you? .... So long old man!
And in this example, they did not use any article.