Difference Between Dates in Days When One Date is Blank

I want to show how many days it takes to resolve an issue. I want the result to display in Days. However when the Resolved Date is blank, I want the result "Aging" to show how many days from "Opened" to Today so it will show how many days it has remained unresolved. Sample attached.

I think you have the answer in C2, you need to drag it down....

I am an idiot! Thanks! The weird thing is, when I had in the larger table and dragged it down, there were still blanks. But now that I am doing what you said in the smaller sample, it works. Go figure! Thank you

How do I show the result in Days...meaning how can I add the word days to the result?

No problem.
Add &" days" at the end of the formula

Thanks! It is coming back with many numbers past the decimal point and would not allow me to change the format. So I will just change the result header to "Aging in Days" and be done with it.

You're right, sorry
Try this:
=TEXT(IF(B2="",TODAY()-(A2),B2-A2),0)&" days"