Here is the list of the Chinese Zodiac:
When people first know each other, they typically ask for which Zodiac Animal they belong to.
For example, I am a Snake, Wendy is a Horse, and Yifan is a Pig. :-)
Since there are 12 years in between of two same animal, it is pretty easy to calculate how old is someone. The age is not as a secret as in western world, anyway.
We just said goodbye to the year of Rat, and stepping into the year of Ox.