Use of
- Select the date of birth in the calendar or enter it yourself.
- If you are curious about the age of a specific test date or contract date, please change it to that date.
- When you press the calculate button, the international age is widely displayed, underneath which the age, the age, the next birthday, the D-day, and the number of days lived come together.
- If you press the Copy Result button, you can copy the calculation result into text and paste it into the messenger.
International age calculation
First implemented from 28 June 2023. The International AgeAccording to the law, the age is interpreted as international age, as long as there is no special regulation in laws, contracts, public documents, etc. International age begins the date of birth with age 0 and adds one year each time the birthday comes back, the calculation form is as follows.
International age = Standard Date Year − Year of birth (If your year’s birthday has not yet passed on the default date, click 1 here. The new age applies from the date of your birthday.)
| Tagged as | Method of calculation. | Example: 1 September 2000, base date 31 July 2026 |
|---|---|---|
| International age | Date of Birth Year − Year of Birth, before Birthday −1 | 2026 − 2000 − 1 = 25 years The Birthday) |
| old age | Date of birth - Date of birth. | 2026 − 2000 = 26 year old |
| Three years old. | Year of birth + 1 | 2026 − 2000 + 1 = 27 years |
The age varies up to two years, depending on the way the same person uses it. Age is a traditional semantic that increases by one year on January 1 every year, and age is a way to see only the annual difference regardless of birthdays. After the implementation of the international age unification law, international age is used in most official places such as hospitals, contracts, administrative documents.
Knowing good information.
Not all age criteria have changed to international age. Some regulations remain due to the need for administrative convenience and collective management old ageStandards for representation. Military lawIt is determined by the age of military service duty, such as the age of military service duty examination, such as the age of the year in which it becomes "○○". Protection of YouthIf you are younger than 19 years of age (except for those who have reached January 1 of the year when you are 19 years old), the purchase of mainstream or tobacco will be judged on the basis of the year rather than the date of birth. The primary and secondary school admission age is also operated as usual. Therefore, it is necessary to have a habit of verifying which age criteria are applied according to the situation.
Those born on February 29 have their actual birthday only once in four years. How to celebrate your birthday on March 1stCalculate as international age and next birthday, so in matters that require legal judgment, please follow the interpretation of the relevant agencies.
The results of this calculator are for reference and have no legal effect. Important matters such as military service, welfare, contract, please re-check with the official standards of the agency.
Frequently asked questions.
What is International Age?
In accordance with the regulations implemented on June 28, 2023, if there is no special regulation when indicating age in laws, contracts, public documents, etc., it will be interpreted as international age.
How is International Age calculated?
After deducting the year of birth from the year of the reference date, add 1 if the year's birthday has not yet passed on the reference date.
When is your birthday calculated on February 29?
This calculator uses a case-by-case method of calculating March 1 as your birthday in a calendar year that does not have February 29. Please follow the interpretation of the relevant authorities if legal judgment is required.
Are you still using age?
No. Some regulations, such as the target age for military service judgment examination in the military service law and the youth standards in the youth protection law (under the age of 19 years), are still based on the age (current year-to-year birth) for administrative convenience.
Announced year of birth?
No. All calculations are processed only within the browser, and the date of birth or base date entered is not sent or stored to the server.