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Example: Calculate Your Current Age with DATEDIF. 1  Enter your birth date into cell E1 of the worksheet. 2  Type =TODAY() into cell E2. 3  Type the following formula into cell E3. = 4 DATEDIF (E1, TODAY(),Y) & . & 5  DATEDIF (E1, TODAY(),MD) &  Days.
You can calculate age on Excel for a many applications by combining an undocumented function and the date format for cells. Microsoft Excel internally stores dates as serial numbers, which is the number of days a date is from Jan. 1, 1900. Keep this in mind as you set up your age calculation formula.