In China, family names come first followed by given names. In business/formal settings, people normally address each other by their family name or title, such as "Mr. Chen", or "Director Huang". Linking names with business positions shows respect for the person, whom you are calling. And don't call someone by just their first name unless specifically asked or if you are long-time friends.
Terms of kinship are often used for close non-relatives. A younger man often calls a man who is five years older than him "big brother" and someone who is considerably older "uncle." Chinese often address their friends as juniors and seniors even if they are just a few months younger or older. When a Chinese person asks someone his/her age, he/she just wants to know how to address the person.
