Age can arise in a Korean introduction, but a number does not settle every social relationship. International age, year age and traditional counting age are different conventions. Clarify the question before choosing a number or changing speech style.
Know which number is requested
International age counts completed years since birth. Year age subtracts birth year from the reference year. Traditional counting adds one to that difference. Record the reference date when doing arithmetic instead of automatically subtracting one or two from an unspecified age.
Keep the legal background separate
The Ministry of Government Legislation’s 2023 explanation describes international age as the default for administrative and civil matters unless a specific provision differs. It also describes exceptions. Check the current rule for an actual application rather than relying on a social etiquette guide.
Use a clarification phrase
만 나이로 말하면 돼요? asks whether to give international age. 몇 년생이에요? asks which year someone was born. These constructed examples illustrate different questions; they do not mean everyone must disclose a full birthday to a new acquaintance.
Choose speech from the relationship
Begin politely with unfamiliar people and consider the setting, role and expressed preference. Do not assume that being older permits casual speech or that a shared birth year automatically establishes intimacy. If uncertain, ask how to address the person.
A practical next step
Work through an age example with a reference date
For an arithmetic example, someone born on December 10, 2000 is 25 on October 20, 2026, because the December birthday has not yet occurred. The person becomes 26 on December 10, 2026. The reference date is essential; a birth year alone does not give an exact completed age.
This example illustrates completed-years calculation, not eligibility for every Korean program. If a form asks about admission, employment, insurance or another specific rule, identify the responsible institution and its stated date and age definition.
| Compare | What to record |
|---|---|
| Date of birth | Use the complete year, month and day. |
| Reference date | The day for which the age is being calculated. |
| Rule | The institution’s actual definition and any separate eligibility conditions. |
A reader question: Can I use an age calculator to decide every legal eligibility question?
No. A calculator can perform arithmetic, but eligibility can depend on a particular law, reference date or institutional rule. Read the rule for the decision you are making and ask the responsible institution when the wording is unclear.
Further reading: Ministry of Government Legislation: age-counting guidance. Check the specific entry, object, edition or current provider notice relevant to your question.
Editorial revision: October 20, 2026. Practice examples are editorial constructions. The discussion distinguishes documented information, interpretation and personal choice.