The basic age formula
- Start with the current year minus your birth year: 2026 − 1995 = 31
- Check if your birthday has occurred yet this calendar year. If not, subtract 1.
- If the current month is before your birth month, subtract 1 more year.
Example: Born September 20, 1995. Today is April 13, 2026. Age = 30 years.
How to calculate your age in days
A 30-year-old born in 1995 has lived through approximately 8 leap years. 30 × 365 = 10,950 + 8 = approximately 10,958 days as a baseline.
Age in different cultures
Korean age: Traditionally counts time in the womb, so you are 1 at birth. Age increments every January 1st. South Korea officially transitioned to international age counting in June 2023.
Interesting age milestones in days
- 1,000 days old: approximately 2 years and 9 months
- 10,000 days old: approximately 27 years and 5 months
- 20,000 days old: approximately 54 years and 9 months