What is the difference between international and Korean age?

International age is birthday-based (the global standard); Korean counting age counts the birth year as 1, so it is usually 1-2 years higher.

What changed with the 2023 age unification?

Since June 2023, international age is used by default in law, administration, and contracts unless stated otherwise — usually 1-2 years younger than the traditional Korean age.

How is age calculated for early-year births?

International age depends only on the birthday, so it is unaffected. Korean counting and year ages use only the birth year.

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2026International age (birthday-based)

Date of birth

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What is the age calculator?

Since June 2023, Korea legally uses international age. International age increases by one on each birthday; Korean counting age counts the birth year as age 1 and adds a year each New Year; year age is the current year minus the birth year.

Age types

International age: birthday-based (legal standard since 2023)
Korean counting age: 1 at birth year, +1 each New Year
Year age: current year − birth year

Frequently Asked Questions

What is the difference between international and Korean age?: International age is birthday-based (the global standard); Korean counting age counts the birth year as 1, so it is usually 1-2 years higher.
What changed with the 2023 age unification?: Since June 2023, international age is used by default in law, administration, and contracts unless stated otherwise — usually 1-2 years younger than the traditional Korean age.
How is age calculated for early-year births?: International age depends only on the birthday, so it is unaffected. Korean counting and year ages use only the birth year.

Last updated: July 2026

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