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Age Calculator

Calculate your exact age in years, months, and days

About this tool

The Age Calculator works out your exact age in years, months, and days from any date of birth. It also surfaces life statistics like total days lived, leap years experienced, and a countdown to your next birthday — all computed locally in your browser so your date of birth never leaves your device.

How to use

  1. Pick your date of birth from the date picker.
  2. Leave the "as of" date on today, or set it to any past or future date to check your age at that moment.
  3. Review the main result: your age in years, months, and days.
  4. Scroll to see bonus stats such as total days lived, next birthday countdown, and your zodiac sign.
  5. Save the result to your local history to revisit later.

Common use cases

  • Confirming your exact age for legal documents or visa applications.
  • Calculating a child or pet’s age in precise days.
  • Planning milestone celebrations like the 10,000th day of life.
  • Finding the age gap between two family members.
  • Preparing birthday trivia such as how many leap years someone has lived through.

Frequently asked questions

Does the calculator handle leap years correctly?

Yes. Date math uses the Gregorian calendar including leap days, so people born on February 29 are counted accurately.

Can I calculate age on a past or future date?

Yes. Change the "as of" date to any date and you will see how old you were — or will be — on that day.

Is my date of birth stored anywhere?

No. Everything runs client-side. Your date of birth is never sent to a server. Only your saved history lives in your own browser’s storage.

Why does the result sometimes differ by one day?

Age depends on your local timezone. The calculator uses your device clock to decide what "today" means.