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To calculate a person's age from their birth date, you can use the YEARFRAC, INT, and TODAY functions. In the generic version of the formula above, birthdate. Step 1: Enter current date in a blank cell, such as 2016/4/7 in Cell B2. Step 2: In another blank cell (says cell C2), enter the formula =INT((B2-A2)/365), and press the Enter key. Some would like to apply the DATEDIF function to calculate the age. Jump to How to create an age calculator in Excel - The calculator uses the following formulas to compute age based on the date of birth in cell A3. To calculate the age of a person in Excel, use the DATEDIF function and the TODAY function. Enter the date of birth into cell A2. Date of Birth in. Date of birth calculator excel.