Hi Heather,
A Due Date is not even saved with Credit Notes, as they are not really 'due' in the same way that invoices are 'due'. So there are no options for printing credit notes in the aged column if you want to sort them by the Due Date. Credit notes are always considered Current, as is unapplied Cash.
If you want to use the amounts based on the Document Date rather than the Due Date, then indeed you can have Credit Notes aged in exactly the same way as invoices, based on the document date.
_________________________
Regards,
Softrak Tech Support