While a journal entry would balance the amounts, it would not fix the actual cause of the difference between the two reports, SarahG7.
First, confirm that both the Balance Sheet and the A/P Aging Report are run on the exact same date.
Aside from that, the Balance Sheet always displays the cumulative total of the account as of the date specified. On the other hand, the amount in the A/P Aging Report comes from all unpaid bills that contribute to the total amount for the chosen period.
Next, double-click the total amount in each report to open the transaction detail list. Then, review both lists to look for transactions that are present on the Balance Sheet but are missing from the Aging Report (or vice versa).
Once you locate the incorrect transaction, you must either make the necessary adjustments or delete it.
Since this directly impacts the accuracy of your official financial reports, I strongly recommend consulting your accountant for additional advice to ensure everything is done properly.
Don't hesitate to reply or post new inquiries if you need anything else.