There is no need to create an Age Debtor report it is already part of the R4 system
Simply from the main menu, click Reports. Type in the search bar: Age Debtor.
Click on the report and click Run.
Please note: This report might be hidden, if it has been click the message "There is 1 hidden item excluded from the search, click here to show this item"
Hope that helps with the age debt question. Please can you explain what you need by Age receivable report? Is this not the same thing?