Get-ChildItem -Recurse -Directory -Path 'D:OlderfilesSourceDocuments' -Filter 'Archive' |
    ForEach-Object {
        Get-ChildItem -File -Path $_.FullName |
            ForEach-Object {
                if ($_.LastWriteTime -lt (Get-Date).AddDays(-120)) {
                    Remove-Item -Path $_.FullName -WhatIf
                }
            }
    }

powershell -NoLogo -NoProfile -File "delold.ps1"