Recursively Clean up Files/Folders in a directory by the Modified Date (Age) of File

Cleanup_FilesByAge.ps1

# Function that deletes any files, recursively, from a directory that are older than X days for modified day.
# this is mostly stolen from http://stackoverflow.com/a/19326146/18524
function Cleanup-Dir
{
    param([string]$path, [int]$limit)

    $minDay = (Get-Date).AddDays(-1 * $limit)

    # delete files older than $limit
    Get-ChildItem -Path $path -Recurse -Force `
        | Where-Object { !$_.PSIsContainer -and $_.LastWriteTime -lt $minDay } `
        | Remove-Item -Force -ErrorAction SilentlyContinue

    # delete any empty directories left behind after deleting old files
    Get-ChildItem -Path $path -Recurse -Force `
        | Where-Object { $_.PSIsContainer -and (Get-ChildItem -Path $_.FullName -Recurse -Force | Where-Object { !$_.PSIsContainer }) -eq $null } `
        | Remove-Item -Force -ErrorAction SilentlyContinue
}

#now, run this cleanup function on ...
Cleanup-Dir "C:\temp" 30
Cleanup-Dir "C:\Users\*\Backup" 14    # powershell can do fancy stuff with regex and wildcards