PowerShell script for deleting documents in a SharePoint Document Library based on dates

Below script works for deletion but it is unable to delete folders.

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$site = Get-SPSite "http://spdev1/sites/test"

foreach ($web in $site.AllWebs) {

# update the value for targeted Doc Lib $_.Title -eg "Library Title"

   $Libraries = $web.Lists | where {$_.BaseType -eq "DocumentLibrary" -And $_.Title -eq "Demant"}

    foreach ($library in $Libraries) {

       Write-Output "Getting files from $($library.Title)"

# get all the word & Excel files older than October 28, 2014 update below line

       $Files = $library.Items | where {($_.FileSystemObjectType -eq "File") -And ($_.File -Like "*.docx" -Or $_.File -Like "*.doc" -Or $_.File -Like "*.xls" -Or $_.File -Like "*.xlsx") -And ($_.File.TimeCreated -lt "10-28-2014")}

        foreach ($file in $Files) {

            Write-Output "Deleting file $($file.Name)..."

            $file.Delete()

        } # foreach file

    } # foreach library

 } # foreach web