Age Calculator

How to Use Enter your date of birth. Your age in years, months, and days is calculated. The tool also shows how many days you have been alive and the number of days until your next birthday. Calculate age relative to any specific date, not just today. Who Is This For Anyone who needs to confirm their precise age for a legal document or form, parents tracking a child's age in months, and users curious about age under Korea's 2023 unified age standard. Key Features • Age in years, months, and days • Total days lived • Next birthday countdown • Age as of a specific reference date • Korean age (세는 나이) and Korean legal age (만 나이) Frequently Asked Questions Q: What changed with Korea's June 2023 age unification law? A: All legal and administrative contexts now use 만 나이 (international age), where you age by one on your birthday. The older Korean age system (세는 나이) is no longer used officially. Q: What if I was born on February 29 (leap day)? A: In non-leap years, the birthday is treated as either February 28 or March 1 depending on the legal context. The tool handles this edge case automatically. Q: How does Korean age (세는 나이) differ from international age? A: In the traditional Korean system, you are 1 year old at birth and gain a year every January 1. International age counts from zero and adds a year on each birthday. Tips For legal matters — employment, medical, and government services in Korea — always use 만 나이 (international age) as of June 2023.