Hey @mary.maria GL entries that hit AP or AR accounts most definitely will show up on an aging report by default. If they don't on yours, you're not using the default reports. I know because I've had a fair number of clients not entirely happy with that behavior. 😀
If you hit an AP/AR account on a JE and assign a vendor/customer, it will show up as a balance on the aging just like it was a regular invoice and can be applied against payments. If you don't assign a vendor customer, it will show up at the top of the report as "no customer/no vendor."