Count number of people across multiple columns with criteria

问题

I have a worksheet that has 6 columns for each employee and family members birthdays. I am looking to get the total number of kids that are 20 years old and younger without adding any additional columns based on the date in cell B1. I looked into using COUNTIF, but it needs a range to execute.

Here is how my workbook looks:

I am looking for one formula that takes all birthdays from columns C-F and counts how many children are younger than 20 years old. Is this possible?

Answers I am seeking from formula:

Thank you!

回答1:

Use COUNTIF():

=COUNTIF(C3:F3,">" & DATE(YEAR($B$1)-20,MONTH($B$1),DAY($B$1)))

来源：https://stackoverflow.com/questions/49285970/count-number-of-people-across-multiple-columns-with-criteria