How to Use the Age Calculator
Enter your date of birth using the date picker. The calculator will instantly display your exact age. By default it calculates your age as of today, but you can change the "Age As Of" date to any past or future date — useful for finding out how old you were on a specific occasion.
Frequently Asked Questions
How is my exact age calculated?
Your exact age is calculated by finding the difference between your date of birth and today's date (or any "as of" date you choose). The calculator counts full years first, then remaining full months, then remaining days — correctly accounting for leap years and the varying lengths of each month.
How many days old am I?
Your total days lived is the number of calendar days that have passed since your date of birth up to and including today. For example, someone born on 1 January 1990 would be about 13,144 days old on 1 January 2026. Use the calculator above to find your precise count.
How does the next birthday countdown work?
The calculator finds the next occurrence of your birth month and day starting from today. If your birthday has already passed this calendar year it shows the countdown to next year's birthday. If today is your birthday it shows 0 days — happy birthday!
What if I was born on 29 February?
If you were born on leap day (29 February), the calculator handles non-leap years gracefully. For the birthday countdown in non-leap years, 28 February is used so your countdown stays as close as possible to your actual birth date.