Korea's Unified Age Act: What Changed, What Didn't

On June 28, 2023, Korea's "Unified Age Act" made international age the default in law. But it did not abolish the traditional systems entirely — military, alcohol sales, and school enrollment still use "year age." Here's what applies where in 2026.

1. Three Age Systems

• International age — age from birthday (0 at birth, +1 per birthday)
• Year age — current year − birth year
• Korean age — 1 at birth, +1 on each Jan 1. Officially abolished in 2023.

2. What the Unified Age Act Changed

All civil and administrative contexts now default to international age unless specified otherwise. Most healthcare, labor, and government rules follow suit.

3. Where "Year Age" Still Applies (2026)

① Military service

Assessment during the year you turn 19 in year-age terms. In 2026, all 2007-born males.

② Youth Protection Act (alcohol/tobacco)

Legally "under 19 international age," but shops apply year-age in practice: everyone born in 2007 can buy from January 1, 2026 regardless of birthday.

③ Elementary school enrollment

Enters in the calendar year turning 6 year-age. 2026 cohort: those born in 2019.

4. Everyday Implications

• Friend groups — Korean "same-age peers" is a year-age concept.
• Health services — mostly international age (e.g., free flu shots at 65+).
• Labor contracts — youth work hour limits and minimum working age (15) are international age.

5. Common Confusion Post-Reform

Saying "I'm 30 this year" now defaults to international age. Someone born June 1995 is not yet 30 in April 2026 — they're 29 until June. Government and HR documents now use "man XX-se" (만 XX세) for clarity.

6. Calculators

• Korean Age Calculator
• BMI Calculator
• Ovulation Calculator