Questions:
(1) Is it polite to ask other’s age in western?
(2) What can you say when you want to give greeting to someone?
(3) How to Introduce the honored people?
(4) Can you tell the differences between western manners and eastern manners?

Western Manners

 It is a great help for the person who is learning a foreign language to know some customs of the foreign country. I will tell you western manners. 
  In western, it's impolite to ask others' age, income, properties. 
  If you are wearing a hat which can be taken bold of easily, it is customary to raise it slightly off your head when you greet a girl or a woman. 
  It is customary to shake hands when you first meet someone. And usually friends shake hands when they meet after not having seen each other for some time. However it is not necessary to shake hands.

It is always good form to use the name of the person you are greeting. You might say, "Good Morning, Mr. White" or" Hello, Franklin.," A person's surname should be used unless he is good friend or school-mate . 
  If you introduce the honored person, you can use the following: 
  ① May I introduce you to Maggie? 
  ② Let me introduce Mr. White, the famous professor to you. 
  If on formal occasion, you may use the following: 
  ① I'd like you to meet my brother. 
  ② Do you know Susan, my good friend?

 If you want to meet someone, it is better to ask a friend who knows him to introduce you. But sometimes at a meeting it is all right to introduce yourself to a fellow-student, or to one of the same sex and position.