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1. Ask your parents and other people present at your birth. Your parents might remember when you were born, or direct you to other family members or friends who were there when you were born. They may also have a copy of your birth certificate.
Get age from birthday. If you need to calculate a person's age from their birth date, you can do so with the YEARFRAC, INT, and TODAY functions. In the generic version of the formula above, birthdate is the person's birthday with year, and TODAY supplies the date on which to calculate age. Because this formula uses the TODAY function, it will continue to calculate the correct age in the future as well.