Popup 40 days after timestamp using vba code

Is it possible to have a form pop up after 40 days
notifying the user that
there data is old and should be revised?

maybe like something like "IF Now()-Column("e")>40 days
Then display once msg (please update the value(s)
located in cell B1, C1, B9, D11, ect..)"

column("E") being where my time stamp is set when someone posts data

If it is possible could the pop up occur once on the
excel file opening and list all the updates needed
instead of a ton of individual pop ups for each
old data entry?

thanks a ton for any help yall can give.