formula in excel to convert a date of birth into an age
Example 3. Converting date of birth to age with YEARFRAC function. One more Excel function to convert the birthdate to age is YEARFRAC that calculates the fraction of the year, i.e. the number of whole days between two dates. Like the DATEDIF function, YEARFRAC takes the start date (birthdate) in the 1st argument and the end date (today's date) in the 2nd argument.