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Age Calculator

Calculate exact age in years, months, and days.

How Age Is Calculated

Age is the elapsed time between a birth date and a reference date (defaulting to today). This calculator counts complete years first, then the remaining whole months, then the leftover days — correctly handling months of different lengths and leap years by borrowing from the previous month when needed. It also shows the total number of days lived. All math runs locally in your browser.

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