What is a bad year? For example, 20 years old is a bad year, starting from 19 years old or starting from 20 years old.

1: A bad year may be calculated according to a person's birthdates. Every time I meet your zodiac sign, it's called a bad year. 2. It may be based on nine years. It has been nine years since the day you were born, that is, nine years old. 18, 27 years old, 36 years old::::::::