Beards are also called full beards, which means beards grow all over the mouth, chin and cheeks. The shape of the beard, the coverage area (mustache, goatee, sideburns, etc.), and the age at which the beard begins to grow are all genetically inherited.

Han men rarely have beard genes, most of them have mustaches and goatees.

Some people with beard genes start growing at a very young age, such as during the developmental stage, and some do not grow into beards until they are very old, so it is difficult to say.