I need to have a report that will list all the workstations that are 3 years old or older.  We have the acquisition date filled on all the workstations.  The problem is that when I try to filter on that date, I can't enter a custom number of days or months out from that date.  How might I accomplish this? 

I can put in a custom date, but I was wondering if I can make the report to have a rolling date, so I don't have to update the report with a new date every time I run it.

Also, I would like to have a field that allows me to designate what type of workstation the computer is.  Is it a laptop, workstation or thin client.  These different types will have different replacement schedules.