You can use Robocopy to accomplish this. Robocopy is included with Windows Vista, 7, and Server 2008 and it is available in the Windows resource kit for any prior versions of Windows. Robocopy has many options, but one that may work for you is: /MINAGE:n : MINimum file AGE - exclude files newer than n days/date.
For example:
ROBOCOPY [source_folder] [destination_folder] *.* /E /MOVE /MINAGE:30
This will move all files and subfolders older than 30 days from the source path to the destination path.
Here is a link to all of the Robocopy parameters:
http://ss64.com/nt/robocopy.html