Require help fine tuning script

Script removes the files by date but i want to ensure that the most recent ( 7 Files ) remain regardless of date.
And perhaps email to say nothing had been done

  var Folders = new Array(
    '1YS60U0Cts******I2Lqxb6-_TS0LMho1',   // Calllogs
    '1Vofy1iPjV******yFc11Nhmr6DnHM736',   // Messages
    '1iP-TAOAH_******6jvIuN6Pnln2w6R3g',   // Contacts
    '1kDCzGFu9d******v33PXklT7ds5B6G11',   // Calendars

  );
  var Files;

  Logger.clear();

  for (var key in Folders) {
    Folder = DriveApp.getFolderById(Folders[key])
    Files = Folder.getFiles();
    
    Logger.log('Opening Folder: ' + Folder.getName());

    while (Files.hasNext()) {
      var File = Files.next();
      

      if (new Date() - File.getLastUpdated() > 14 * 24 * 60 * 60 * 1000) {
        File.setTrashed(true);  // Places the file in the Trash folder
                                //Drive.Files.remove(File.getId()); 
                                // Permanently deletes the file
        Logger.log('File ' + File.getName() + ' was deleted.');
      }
    }
  }

  if(Logger.getLog() != '')
    MailApp.sendEmail('My Email Address', 'Backups have been removed from Google Drive', Logger.getLog());
}````