Pretty simple script, this just remove files from your downloads folder that are older than x amount of days (by default its set to 60).
$Paths = @(
"%userprofile%\Downloads\"
)
$Days = 60
$limit = (Get-Date).AddDays(-$Days)
foreach ($Path in $Paths)
{
# Delete files older than the $limit.
Get-ChildItem -Path $path -Recurse -Force | Where-Object { !$_.PSIsContainer -and $_.CreationTime -lt $limit } | Remove-Item -Force
# Delete any empty directories left behind after deleting the 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 -Recurse
}