When I address an elder, I should not call him by his given name.This is in accord with ancient Chinese etiquette. In front of an elder, I will never show off.
In ancient China, a male person had at least two names. The first name was the “given name”, which was given to him by his parents when he was born. A second name was given to him by his friends when he reached the age of 20, at a “Ceremony of the Hat” given in his honor to announce his coming-of-age. After that only his parents called him by his “given name”. Out of respect, everyone else, including the emperor, could only call him by his second name. The only exception was if he committed a crime. During sentencing, he would be called by his “given name”.