The Correct Way to Calculate Age
Start with birth date and today's date. Calculate year difference, then adjust if today's month/day hasn't reached the birthday yet this year. Account for varying month lengths and leap years for precise results.
Step-by-Step Example
Born: March 15, 1990. Today: April 28, 2026.
Step 1: Year difference: 2026 - 1990 = 36 years
Step 2: Has birthday passed? April 28 > March 15 = Yes
Step 3: Result: 36 years, 1 month, 13 days
Common Age Calculation Pitfalls
- Leap year birthdays (Feb 29): In non-leap years, celebrate on Feb 28 or Mar 1 depending on jurisdiction
- Simple year subtraction: 2026 - 1990 = 36, but if birthday hasn't passed yet, you're still 35
- Different calendar systems: Korean age system counted years differently (though changed in 2023)
- Timezone edge cases: Born near midnight? Your "birth date" could differ across timezones
Calculate Your Exact Age
Use our Age Calculator to get your exact age in years, months, days, hours, and even seconds — plus your next birthday countdown.