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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.
The simplest way to calculate age in Excel is to subtracting the current date from the birth date and divide this result by 365.25 (the average number of days in a year).This resulting value is then truncated to an integer using the Excel Int function.This is shown below:f you want to create a formula for age calculation in Excel, it is important that you understand that dates are simply stored as integers in Excel. For example, in most computer systems, Excel stores the date 01-Jan-1900 as the number 1, the date 02-Jan-1900 as the number 2, etc.