An aging in any software is open invoices only. If you want to include paid invoices run an invoice list 4-1-2, status 1-4.

Two aging reports, 4-1-3-21 and 4-1-3-26, reconstruct the aging as of the end of a specified period. Thus, if you run the aging as of the end of period 10, you will find invoices open at the end of period 10 that you know were paid during periods 11 and 12. If you want an aging which shows only what is open today, run the reports with a blank period selection or with the current period selected.