Hello @JenniferZ02 ,
Our coding makes it so that reporting continues indefinitely. You may even see contacts' individual engagement histories sow that they've opened an old email recently. Similarly, in a campaign's actual reporting, you can check to see all clicks and all opens to see if an old campaign has been opened recently. While we won't necessarily send you an automatic email update of your campaign's stats beyond the first week, the actual reporting in our system doesn't stop.