Calculate exact age in years, months, and days from a birth date.
International ('man') age counts the full years actually lived since birth. Since June 28, 2023, Korea uses this international age for administrative and legal purposes. Compute it as (this year − birth year), minus 1 if this year's birthday hasn't occurred yet.
Example: someone born May 10, 2000 is 25 as of June 2025 (birthday passed); before the birthday they would be 24.
Formula
age = (this year − birth year) − (1 if birthday not yet passed)
Source:법제처 — 만 나이 통일
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