In this Excel tutorial lesson, you will learn how to calculate the date difference between two dates. In an Excel spreadsheet, you can calculate the age based on the date of birth.

What is interesting is the number of options. Values can be expressed in years, months, or days. Excel can automatically calculate and display the age based on the date of birth.

## Age calculator

1. In the table, put the necessary data, such as name and date of birth.

2. Click on the cell where you want to see a person's age in years (for example, it is C2). Then in the box, type the following formula:

**=DATEDIF(B2,TODAY(),"Y")**

B2 is the address of a cell containing a date of birth. Press the Enter key. Age will be calculated as indicated by our cells.

In the same way, you can show in Excel your age in months.

To do this, repeat steps 1 and 2, except that in the formula, instead of Y put M. The formula is the following entry:

**=DATEDIF(B2,TODAY(),"M")**

To calculate in Excel the number of days that have passed since a certain date, such as the date of birth, also repeat steps 1 and 2. This time the formula looks like this:

**=DATEDIF(B2,TODAY(),"D")**

Of course, instead of always serving the B2 cell address of the date on which Excel is to start counting. An example formula is:

**=DATEDIF(B2,"2013-5-1","M")**