For decades, Korea used a unique age-counting system that confused every foreigner who visited. In June 2023, Korea officially standardized to the international age system. But the old system is still culturally important. And you'll still hear it.
The three systems
Korea actually had three age systems running simultaneously:
1. Korean age (한국 나이): the traditional one
- Everyone is born age 1 (the time in the womb counts)
- Everyone gains a year on January 1st, not on their birthday
- Result: a baby born on December 31st becomes "2 years old" the next day
2. International age (만 나이)
- The system the rest of the world uses
- You're 0 at birth, gain a year on your birthday
- Now the legal and official standard in Korea (since June 2023)
3. Year age (연 나이)
- Current year minus birth year
- Used in school contexts and military
How to calculate Korean age (historically)
Korean age = International age + 1 (or +2 if your birthday hasn't passed this year)
Born 2000, it's 2024, birthday already passed: 24 (international) → 25 (Korean) Born 2000, it's 2024, birthday not yet: 23 (international) → 25 (Korean)
Why does it matter now?
Even with the legal change, many older Koreans and traditional contexts still use Korean age socially. If someone asks 나이가 어떻게 되세요? (How old are you?), clarify which system you mean or just state both. Also: K-pop idols are still often described using Korean age in media, making some fans confused about why their "ages" seem off.
How to talk about age in Korean
나이가 어떻게 되세요? How old are you? (polite) 몇 살이에요? How old are you? (casual) 저는 스물다섯 살이에요. I'm 25 years old. (native Korean number + 살) 저는 25살이에요. I'm 25. (common casual form)
Use native Korean numbers (not Sino-Korean) with 살:
- 스물 = 20
- 스물다섯 = 25
- 서른 = 30
- 마흔 = 40
Why age matters so much in Korean culture
Korean is a hierarchical language: you speak differently to someone older, younger, or the same age. Before you can establish how to speak to someone, you need to know the relationship. This is why Koreans often ask each other's age early in a conversation. It's not rude. It's logistically necessary to know which speech level to use. If you're older: the younger person will typically use formal/polite speech (해요체). If you're the same age: both can agree to speak casually (반말/banmal) together. If you're younger: you'll use polite speech to the older person.
The phrase for "we're the same age"
우리 동갑이에요! We're the same age!
This is a significant social moment. Once confirmed, both parties often switch to casual speech together. It's a small but meaningful shift in how Koreans bond.
Understanding age in Korean isn't just linguistic. It explains a lot about how Korean social interactions are structured. For more cultural context woven into your language learning, a structured Korean course integrates culture notes directly into its lessons.