만 나이 계산기 – 세는 나이·연 나이·띠 한 번에 확인

Since June 2023, South Korea officially uses the international age system (만 나이): you are 0 at birth and gain a year on each birthday. The traditional counting age (세는 나이) starts at 1 and increases every January 1st, while the year age (연 나이) is simply the current year minus the birth year.