Welcome to the Community, @niki8.
At this time, there's not a way to sort the A/P Aging Report to show the newest dates first. I'm going to submit feedback for you on my end to our Product Development Team about bringing in a feature that will allow this to happen. You can visit our Blog to see all the new updates to our Products, as well as seeing what's coming in the future.
Let me know if you have any additional questions or concerns. I'm always here to help. Have a great day!