The transactions, which are recorded in MoneyWorks needs to be posted before it updates the general ledger (GL). Therefore, the aged receivables show only the posted sales invoices.
From the Show menu | Transactions | Receivable (under the Transactions by Status) gives a quick overview of the outstanding sales invoices, whereas the detailed ageing report can be printed from the Reports menu | Receivables & Payables | Aged Receivables report.
You have an option of calculating the ageing by days or period. When calculated by days, the transaction date of the invoice is used, whereas the period of the invoice is used for ageing by period.
Reference: MoneyWorks v7 User Guide, page 167 - Aged Receivables.