Powershell delete Folder if all Files older than x days - powershell

Question

I'm new at PowerShell and don't know so much about it.
I'm searching for a way to delete a folder and all sub-folders if all files in this are older than x days. I have an code to delete all files in a folder and all sub-folders but I don't know how to change it right.
$Now = Get-Date
$Days = "30"
$TargetFolder = "C:\temp"
$Extension = "*.*"
$LastWrite = $Now.AddDays(-$Days)
$Files = Get-Childitem $TargetFolder -Include $Extension -Recurse | Where {($_.CreationTime -le "$LastWrite") -and ($_.LastWriteTime -le "$LastWrite")}
foreach ($File in $Files)
{
if ($File -ne $NULL)
{
write-host "Deleting File $File" -ForegroundColor "Red"
Remove-Item $Location.FullName | out-Null
}
else
{
Write-Host "No more files to delete!" -foregroundcolor "Green"
}
}

Answer 1

Enumerate all folders and sort them longest path first, so you process the directories bottom to top:
Get-ChildItem $TargetFolder -Recurse -Directory |
Select-Object -Expand FullName |
Sort-Object Length -Desc
Filter the list for directories that don't have any file or folder newer than x days in them:
... | Where-Object {
-not $(Get-ChildItem $_ -Recurse | Where-Object {
$_.Creationtime -ge $LastWrite -or
$_.LastWriteTime -ge $LastWrite
})
}
Then remove the resulting folders:
... | Remove-Item -Recurse -Force