How to delete files when a certain number of them (with verification) is exceeded by a script?

Question

PowerShell

Good afternoon. It is necessary to leave the last 7 files in the folder by the date of creation, and delete the rest, but before that, check that the folder really has at least 7 files. How to remove it seems clear, how to calculate, too, seems to understand, but I can’t put it all together. Thank you!

Answer 1

pushd d:\test
for /f "skip=7 delims=" %%I in ('dir /b /a-d /o-d /tc') do  del "%%I"
popd

Answer 2

On Powershell I threw something like this:
$files = Get-ChildItem -Path "c:\test" | Sort-Object creationtime -Descending
$count = $files.count - 7
if ($files.Count -igt 7)
{$DelFiles = $files | Select-Object -last $count
Remove-Item -Path $DelFiles.fullname}