I whipped up handy VB Script that will delete files older then X days in any particular folder. In this case any files that are older then 3 days will be deleted.
Dim Fso, Directory, Modified, Files
Set Fso = CreateObject("Scripting.FileSystemObject")
Set Directory = Fso.GetFolder("C:\FolderContainingFiles")
Set Files = Directory.Files
For Each Modified in Files
If DateDiff("D", Modified.DateLastModified, Now) > 3 Then Modified.Delete