AP Aging can be done simply by entering 12/31/02 as the age from date in AP-H.  
 
You can also get GL Transactions by running GL-C.  Trial balance is a bit trickier.  Run GL-D for all dates, YE journal type.  If you have no 2001 YE entries then the balance forward for the income and expense accounts won't be properly closed out to run a 2002 trial balance.  But if you do have 2001 closing YE entries, then you can fake it out by getting everybody out of hte system, go to AD-A and reset the Fiscal Year start date back to 1/1/02 (or whateer your start date was) and run the trial balance, then go back to AD-A and set the date back to what it should be.