To calculate someone's age in Excel, enter the formula =DATEDIF (A2,TODAY ()," y"), where cell A2 contains the date they were born and "Today" is today's date. Press Enter, and Excel will output ...

Fortunately, Excel offers a built-in function, DATEDIF, which makes it easy to calculate elapsed calendar time. I sent Zee a sample solution, and she wrote back that it was exactly what she had in ...