Batch file for Windows

Unless you're on a truly ancient version of windows, do it in powershell - lots more people using it, plus the built-in help functions mean you can actually more or less teach yourself.

Assuming that your folders are all in a subdirectory called C:\DeleteMe you could use this to identify them:

get-childitem -path "C:\DeleteMe" | Where-Object {$_.Mode -match "^d"}

Get-childItem doesn't differentiate between files and folders, so the results of that are piped through to Where-Object, which checks the Mode attribute. Only results with a mode starting with d (folders) are included.

If you want to limit your script to folders created more than 7 days ago, you'd expand it to:

$today=Get-Date;
get-childitem -path "C:\DeleteMe" | Where-Object {($_.Mode -match "^d") -and ($_.CreationDate -lt $today.AddDays(-7))}

If you instead want to limit your script to folders last changed more than 7 days ago, you'd replace the CreationDate attribute with LastModified:

$today=Get-Date;
get-childitem -path "C:\DeleteMe" | Where-Object {($_.Mode -match "^d") -and ($_.LastModified -lt $today.AddDays(-7))}

Once you know the folders you want to get rid of, you can use a foreach loop to iterate through each of them and delete them. You can also use a try-catch statement to catch errors.

$logfile="c:\Users\MyUsername\Desktop\Foldercleanup.txt";
$today=Get-Date;
"$($today): Running folder cleanup on C:\DeleteMe" | out-file -Filepath $logfile -append
$folderlist= get-childitem -path "C:\DeleteMe" | Where-Object {($_.Mode -match "^d") -and ($_.LastModified -lt $today.AddDays(-7))};
foreach ($folder in $folderlist) {
	try {
		Remove-Item -Path $folder.FullName -Recurse -Force -ErrorAction Stop;
		"Deleted folder $($folder.FullName)!" | Out-file -Filepath $logfile -append
	} catch {
		"Could not delete folder $($folder.FullName), error was $($_.Exception.Message)" | Out-File -Filepath $logfile -append
	}
}

This builds on the list of folders from earlier, iterating through each folder and attempting to delete it. Using the "-Recurse" switch means the Remove-Item command tries to delete all child items in the folder first (required for it to succeed, as you can't delete a parent folder that still has child files or folders), and using Force to allow deletion of hidden and read-only files. The try-catch statement allows you to record any problems deleting files or folders along the way.

That should be enough to get you started. A few commands you'll find helpful if you're learning PowerShell:

• Get-Help - Use in the form "Get-Help Remove-Item" and you'll see information about how to use that command. If you're very new, use "Get-Help Remove-Item -full" or "Get-Help Remove-Item -examples" and you'll see a lot of useful information about how you can use the command.
• Get-Command - Use in the form "Get-Command | Where-Object {$_.Name -match "Item"}" to see all commands containing the word "Item" in their name. Then you can use get-help to see how to use that command.
• Get-Member - Use in the form "$folderlist | Get-Member" to see a list of all the attributes and methods available in a given object type. This will let you work out things like how to tell if a file is older than 7 days, and so on.

As the previous post says, a Google search will show you plenty of results - but tbh if you're looking to learn, figure out how to explain what you want to do and search somewhere like StackOverflow - there are lots of very helpful people out there who'll put the time in to help you solve problems.