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 need to count or calculate number of Leap Years between two dates in Excel or list of two dates in Excel, make use of this formula to get things done.

A TechRepublic member wrote for advice on calculating the years, months, and days elapsed between two dates. This tutorial explains the solution provided by TechRepublic contributor Jeff Davis.