What would the formula be for.....
I need to sum or count the number of people in my sheet that are under 17 and over 65, based on who is checked. Can I do this using a cross sheet formula so all my totals are together? I have both DOB and age columns  can the formula be on the age column or do I need a value column to set age parameters?
Comments

=countifs(age:age, "> 65") will give you the age of everyone greater than 65
=countifs(age:age, "<17") will givey you the age of everyone younger than 17.
You can use a reference from another sheet. Check out my animated gif to see how.

When you reference another sheet you will be able to set up a range from the sheet to pull into your new sheet. If you want the total number of people Over 65 and under 17 you can add the two countifs together. =countifs(age:age, "> 65")+countifs(age:age, "<17")
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