Recently I read about Chinese ancient book talk about how to celebrate birthday, from born to 15 we are god. Can celebrate birthday what ever we want, from16 to 79 we are human, from 80 we are god agian. 16 to 59 we are still young as human and got strong spirits and energey so we don't afraid of satan to bring our life away, can celebrate with family, but we should be careful to celebrate birthday from 60-70, especially 60th is a important age for Chinese people. I'm interested if any culture got the similar rules in their country ?!