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Age Calculator

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Calculate exact chronological age in years, months, and days, plus total days lived and a live countdown to your next birthday.

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How to Use Age Calculator

  1. 1Select or enter your Date of Birth in the primary date field.
  2. 2Optionally adjust the 'Calculate Age As Of' date (defaults to today's date).
  3. 3Click 'Calculate Age' to see your exact Years, Months, and Days breakdown.
  4. 4View additional summary statistics (total months, total weeks, total days, total hours) and your Next Birthday countdown.

Key Features & Privacy

  • ✦Calendar-accurate month and leap-year boundary math (including February 29th birthdays).
  • ✦Displays primary age in Years, Months, and Days alongside total weeks, days, hours, and minutes.
  • ✦Calculates exact months and days remaining until your next upcoming birthday and the day of the week it falls on.
  • ✦Validates against future birth dates or invalid calendar dates with clear error messages.

Frequently Asked Questions

How are months of different lengths (28, 30, 31 days) handled?
The calculator uses exact calendar month rollovers from your birth day-of-month rather than dividing total days by 365.25, ensuring calendar-accurate year, month, and day counts.
What if I enter a Date of Birth later than the target date?
The calculator validates date order and displays a clear error alert asking for a Date of Birth on or before the comparison date.
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