@DanBu 

"The roadblock is that I have invoices with different terms, some with Net 30, others with Net 60, for example. I am wondering how to filter for invoices past their due date. What I find with the report you suggested is that "aging" starts with Day 1. So, if I filter for Aging > 30 days, the report does not make a distinction between Net 30 and Net 60 Invoices. Because of this, I am uncertain if an invoice is past due without looking at each one."

You don't need to look at each invoice.  Day 1 of aging means that it is one day past the due date regardless if the terms are 30, 60, or 90 days.  An invoice with 30-day terms will reach day 1 of aging 31 days after the invoice date which is one day after the due date.   An invoice with 60-day terms will reach day 1 of aging 61 days after the invoice date which is one day after the due date and so on...  Invoices that are not past due are shown in the 'Current' column.