In addition to the above setup information, the ageing process includes an age as of date. If, for example, you are running the ageing today but want to see the accounts as of 11/1/2013, just enter that date in the age as of field.
If you want to group all over 60 day invoices into one bucket, simply enter four tiers (current, 30, 60, and 90 and over). All of the tiers in the above window do not need to be completed. Make the last tier from 90 to 999.
Note that if you have any accounts over 999 days old, you have to write them off, they will fall out of the last bucket. GP does not support an ending of 9999 days.