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.

Since each date is really just a number stored in Excel, to compute the midpoint of two dates you would use the same mathematical formulas you would use to calculate the midpoint of two numbers ...

To calculate the whole age from the date of birth in Excel, you can use the YEAR and NOW functions. As an example, if the date of birth is added in cell A7, then to calculate the total age from ...

Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.