Age Calculation in Excel

You can calculate a persons age based on their birthday and todays date.
The calculation uses the DATEDIF() function.
The DATEDIF() is not documented in Excel 5, 7 or 97, but it is in 2000.
(Makes you wonder what else Microsoft forgot to tell us!)

You can put this all together in one calculation, which creates a text version.
Age is 50 Years, 4 Months and 20 Days
 ="Age is "&DATEDIF(C8,TODAY(),"y")&" Years, "&DATEDIF(C8,TODAY(),"ym")&" Months and "&DATEDIF(C8,TODAY(),"md")&" Days"

Another way to calculate age
This method gives you an age which may potentially have decimal places representing the months.
If the age is 20.5, the .5 represents 6 months.