How to calculate your age
- Enter your date of birth.
- Leave Age on as today, or pick another date to see how old you were or will be then.
- Read your age in years, months and days, with totals in weeks and days below.
How old in days?
Counting your age in days is a fun way to find milestones. You turn 10,000 days old at about 27 years and 4 months, and 20,000 days at about 54 years and 9 months. Pick a future date in Age on to find when yours falls.
Age in different systems
This calculator uses the international way of counting, where you’re 0 at birth and gain a year on each birthday. Until 2023, South Korea also used a traditional system that counted a baby as 1 at birth and added a year every 1 January. Korea now uses the international system for official purposes.