One of the many features of Excel is being nosy. That's right, you can quickly calculate a persons age as long as you have their birth date.

To calculate the age, the DATEDIF function, set to check year, determines the number of years between the date in the DOB cell and the current date.

If you want to calculate the age from the date of birth in Google Sheets, then you can do so using DATEDIF or the Array formula. Learn how!