How to delete old files from with batch file....

I'm using the batch file below to backup certain profile information. I need to have a routine within the batch file that will delete the folders older than a certain date beneath the %user% folder (say, older than 30 days, etc...) . Thanks in advance for any assistance.
Mark

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@echo off
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::::::::::: THIS BATCH FILE BACKS UP SPECIFIC INFO FROM USER PROFILES :::::::::::::::::::::::::::::::
:::::::::::       The \\Srbpnas\Support\ProfileBackups\ComputerList.txt file ::::::::::::::::::::::::::
:::::::::::        must be populated with the PC and user names. ::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

for /f "tokens=1,2" %%a in (\\Srbpnas\Support\ProfileBackups\ComputerList.txt) Do call :process %%a %%b
goto :eof
 
:process
:: variables
set computer=%1
set user=%2
set drive=\\Srbpnas\Support\ProfileBackups
set backupcmd=xcopy /s /c /d /e /h /i /r /y
 
:: Begin Individual User-------------------------------------------------------
echo ### Backing up NK2 Files...
%backupcmd% "\\%computer%\c$\Documents and Settings\%user%\Application Data\Microsoft\Outlook" "%drive%\%user%\%date%_%computer%_NK2"

echo ### Backing up Normal.dot Files...
%backupcmd% "\\%computer%\c$\Documents and Settings\%user%\Application Data\Microsoft\Templates" "%drive%\%user%\%date%_%computer%_Templates"
 
echo ### Backing up Favorites...
%backupcmd% "\\%computer%\c$\Documents and Settings\%user%\Favorites" "%drive%\%user%\%date%-%computer%_Favorites"
::End Individual User----------------------------------------------------------
echo Backup Complete!
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