How old are you in Korea? Enter your date of birth to see your international age (used on official documents since June 2023), your year age (still used for drinking, smoking and military service) and the traditional Korean counting age you may still hear at dinner tables.
Three ways Koreans count age
| Name | Korean | How it works | Where you still see it |
|---|---|---|---|
| International age | 만 나이 (man nai) | Starts at 0, +1 on your birthday | Laws, contracts, hospitals, official forms (standard since June 28, 2023) |
| Year age | 연 나이 (yeon nai) | This year minus your birth year | Alcohol & tobacco sales, military service, some school rules |
| Counting age | 세는 나이 (se-neun nai) | Starts at 1, +1 every January 1 | Everyday conversation, older people, some restaurants and clubs |
On June 28, 2023, Korea made international age the default for laws and public administration. Before that, a baby born on December 31 became "2 years old" the next morning in counting age — one of the most famous quirks of life in Korea. Counting age has not disappeared from daily talk, so it helps to know all three.
Quick example
Someone born on March 15, 2000 is, on October 31, 2026:
| System | Age |
|---|---|
| International age | 26 |
| Year age | 26 |
| Counting age | 27 |
Between January 1 and the day before their birthday, the same person would be 25 in international age, 26 in year age and 27 in counting age — three different answers to the same question.
When year age matters in Korea
- Buying alcohol and cigarettes: the Youth Protection Act uses year age, so you can buy from January 1 of the year you turn 19 by year age.
- Military service: Korean men are classified by year age for conscription.
- School entry: children start elementary school in March of the year they turn 7 by year age (for example, children born in 2020 start in March 2027).
Frequently asked questions
Is Korean age still used after 2023?
Officially, no: laws and public documents use international age. Socially, many Koreans still use counting age in conversation, and year age remains in a few laws such as the Youth Protection Act and the Military Service Act.
What is the legal drinking age in Korea?
You can buy alcohol from January 1 of the year you turn 19 by year age. In 2027 that means anyone born in 2008 or earlier.
Why do Koreans ask my age?
Age decides speech levels and titles in Korean, such as whether to call someone hyung, unni or by name. It is a social question, not a rude one.
Does this calculator store my birthday?
No. Everything runs in your browser and nothing is sent or saved.
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Sources: Korea Law Information Center (Civil Act and Framework Act on Administrative Regulations amendments, effective June 28, 2023; Youth Protection Act).
Last checked October 2026.
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