International Age Calculator
Enter your date of birth to calculate your exact international age and detailed age information. Calculate legal age, birthday countdown, zodiac sign all at once.
Enter your date of birth
Complete Guide to International Age
What is International Age?
International age is the globally standard age calculation method that starts at 0 at birth and increases by 1 on each birthday.
- •At birth: 0 years old
- •On birthday: Age increases by 1
- •Legal standard age
Age Calculation Method
International age calculates the exact age by computing the difference between the current date and birth date.
- •Current year - Birth year
- •Check if birthday has passed
- •Subtract 1 if before birthday
Age Milestones
Childhood/Youth
- • 5-6: Kindergarten
- • 6-11: Elementary School
- • 14-18: High School
Adulthood
- • 18: Legal Adult
- • 21: Legal Drinking Age (US)
- • 16-18: Driving License
Senior Years
- • 62-67: Retirement Age
- • 65+: Medicare (US)
- • 65+: Senior Benefits
Frequently Asked Questions (FAQ)
Q: How is age calculated for February 29 birthdays?
In non-leap years, age increases on March 1. Legally, those born on February 29 are considered to age on March 1 in common years.
Q: Is international age the legal standard?
Yes, since 2023, all legal and official ages in Korea have been unified to international age. All legal standards including contracts, elections, and driver's licenses follow international age.
Q: Do other countries use international age?
Most countries use international age as the standard. International organizations like UN and WHO also adopt international age as the official standard.