Scenario: Emma, a French woman aged 20, wants to marry her Vietnamese boyfriend, who is 19. They applied to register in Vietnam, but the officer refused the file because he is underage. The families ask: why may a woman marry at 18 but a man must wait until 20? How is age counted — is turning 20 enough, or must the birthday pass? And what happens if they marry informally anyway? This is one of the most misunderstood marriage conditions, though the law states it plainly.
The rule: men 20, women 18
Article 8 of the 2014 Law on Marriage and Family sets as a marriage condition that the man be at least 20 years old and the woman at least 18. At least means the birthday must have passed — the 20th birthday for the man, the 18th for the woman. One day short of the birthday still fails the condition, and the registry must refuse.
Why the gender gap? It is a historical feature of Vietnamese law, rooted in views on physical and psychological maturity. Though debated, the rule stands unchanged as of 2026 and applies to every file with no nationality exception — foreigners marrying in Vietnam meet the same ages.
Child marriage: a banned act with consequences
Article 5 lists child marriage among prohibited acts. Marrying while underage not only gets the registration refused; if the couple went ahead with a ceremony and cohabitation, the law does not recognize the relationship as a marriage. Under Article 11, an unlawful marriage may be annulled by the court upon request — legally, the two were never spouses, with knock-on effects for joint property, shared children and past transactions.
Additionally, anyone organizing a child marriage (forcing or facilitating an underage union) faces administrative penalties and, in serious cases, criminal liability. Families must understand: marrying a few months early is not a paperwork shortcut but a legal risk for their children.
Counting age and preparing correctly
Registries determine age from the birth date on the birth certificate or civil-status papers. For foreigners, the passport birth date governs. Practical advice for couples near the threshold: schedule registration after the underage party’s birthday, and bring identity papers clearly showing the birth date for quick verification. Never falsify age on documents — fraud in civil-status files is punished severely and destroys any future registration chance.
One more nuance: the age condition applies at the moment of registration, not the wedding ceremony. Couples who celebrate early and register after the birthday are fully compliant, provided they have not lived as spouses beforehand. Planning the registration date right after the birthday is the simplest lawful path.
Checklist
- Check ages: the man past his 20th birthday, the woman past her 18th.
- Foreigners marrying in Vietnam face the same age standard — no exceptions.
- Age counts from the birth date on the birth certificate (Vietnamese) or passport (foreigner).
- Underage? Wait — child marriage is banned and the union may be annulled.
- Never falsify age on papers; fraud is punished severely.
Frequently asked questions
1. He is 19, she is 20 — who fails the condition?
He does. The law requires men to be at least 20 and women at least 18; they must wait until his 20th birthday to register.
2. A few days short — any flexibility?
No. At least means the birthday has passed; one day short still fails, and the registry must refuse by law.
3. Can an 18-year-old foreign man marry in Vietnam?
No. The age standard applies uniformly to every registration in Vietnam, regardless of nationality.
4. Married and cohabiting while underage — consequences?
The relationship is not recognized as a lawful marriage and may be annulled by the court under Article 11; property and children matters follow the corresponding legal rules.
5. Do parental consent override the age rule?
No. Parental consent cannot replace the statutory age condition; child marriage stays banned even with family agreement.
This article has been quality-reviewed by the FLAW AI Legal Council