Everyone is different.  The same goes for clients, who often asked me how to modify aging periods.  Most Dynamics GP users stick with the standard 30/60/90 day aging periods for both receivables & payables.  However, many businesses have the requirement to insert a 45-day break into the aging process.  This is a two-step process wherein users often forget the second step.

Begin in the Setup menu, selecting either Purchasing & then Payable or Sales & then Receivables. You will find the ability to add up to a total of seven aging periods.  One can adjust aging periods here as desired.  The second (and more difficult) part of the process involves modifying your reports.  Standard GP reports only display four aging periods.  If your company inserts a fifth period, the last period will populate with the report but will not be printed.  If you have experience in Report Writer, you should be comfortable changing the necessary layouts.  If not, try contacting WebSan.  We are experienced in helping companies with this very issue.