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?
Count your age in days 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.