To run the aging report in a different currency, simply follow the steps:
1. Customize the AP Aging report on Reports > Vendors/Payables > A/P Aging > Customize Summary.
2. On "Edit Columns" tab, open "Open Payables" folder and add "Amount (Foreign Currency)".
3. Preview the report.
The "Amount" column displays the amount in the currency set in Setup > Company > Company Information; while "Amount (Foreign Currency)" displays the amount in currency set in the vendor record, under "Financial" tab.