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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.
Assuming a birthdate is in cell B2, the formula to calculate age in years goes as follows: =(TODAY()-B2)/365. The first part of the formula (TODAY()-B2) returns the difference between the current date and date of birth is days, and then you divide that number by 365 to get the numbers of years.