According to Article 6 of China's Marriage Law, the age of marriage shall not be earlier than 22 years old for men and 20 years old for women. You can't get a marriage certificate without reaching the legal age of marriage, so you can't apply for a marriage certificate if you are less than one year old.
Conditions for applying for a permit
1, male at 22 years old, female at 20 years old.
2. Non-consanguineous marriage.
3, can not be banned from marriage disease.
4. Neither party is currently married (unmarried, divorced, widowed).
5. Both parties are willing to marry.