General
Age Calculator
Work out an exact age in years, months and days from a date of birth, plus the next birthday.
Result
Ages count completed months using real calendar month lengths, which is why the day count can shift depending on which months the period spans.
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About this calculator
Why does the month count vary?
Calendar months are 28 to 31 days long. Age counts completed months and then whatever days remain, so the leftover days depend on which months the span covers.
Are leap years handled?
Yes: the day count uses real calendar dates, so leap days are included automatically.
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