Korean age historically meant you were "one" (ν μ΄) the day you were born and gained another year on every January 1st β regardless of your actual birthday. That made most Koreans one or two years "older" in Korean age than in the international counting you're used to. As of June 2023, the official administrative system unified everything around international age, but people still use the old system in casual speech.
The three counts that used to coexist
Before 2023, Koreans routinely tracked three different ages:
- μΈλ λμ΄ (seneun nai) β "counting age." You are 1 at birth and +1 every January 1st. This is the traditional Korean age.
- λ§ λμ΄ (man nai) β "full age." The international standard: 0 at birth, +1 on every birthday. Used for laws like voting and drinking.
- μ° λμ΄ (yeon nai) β "year age." The current calendar year minus your birth year. Used for compulsory military service and school enrollment.
So a person born on December 30, 2000 could have been 24 (counting), 22 (international), or 23 (year-based) β all on the same day in early 2023.
What changed in June 2023
South Korea passed a law in 2022, effective June 28, 2023, that made λ§ λμ΄ (international age) the default for all administrative and civil documents. Your ID, your contracts, your medical records β all of those now use international age.
What did NOT change:
- School-grade placement still uses year-based age
- Military enlistment still uses year-based age
- Casual conversation often still uses counting age β especially among older generations
Why Koreans bring up age so often
Korean grammar and social behavior depend on relative age because the honorific system expects you to know who is older. In a first conversation, it's normal to ask:
λμ΄κ° μ΄λ»κ² λμΈμ?naiga eotteotge doeseyo? (naiga eotteoke doeseyo?) β "How old are you?" (polite)
λͺ μ΄μ΄μμ?myeot sarieyo? (myeot sarieyo?) β "How old are you?" (casual but still polite)
Once both parties know the gap, they settle on speech levels (μ‘΄λλ§ jondaetmal vs. λ°λ§ banmal) and titles like ν (hyeong), μΈλ (eonni), μ€λΉ (oppa), or λλ (nuna).
Vocabulary recap
- λμ΄ (nai) β age
- λ§ λμ΄ (man nai) β international age
- μΈλ λμ΄ (seneun nai) β traditional Korean age
- μμΌ (saengil) β birthday