I have traveled throughout Asia on humanitarian missions and love the Asian protocol. A male child or man is addressed as Elder Brother, a female child or woman as Elder Sister. Someone of the same age as your own could also be addressed as Uncle or Aunty, respectively. For elders it is Grandfather or Grandmother. Every one knows these lines of respect and abides by them.
Politeness is the oil of civilized interaction.
Something we seem to have failed to impart to our young here. There is no earthly reason why a Teacher or Professor should be called by their first name. If they are, it is a sign of total ignorance on the part of the teacher who allows it and on the part of the student who falls into the trap of using it. The line of respect by both parties becomes blurred. My 28 years in the army have taught me that status lines exist for good reason.