It is possible to delete all classified ads that have been created for a certain number of days.
To do this, go to Administration: Operation / Task scheduler
Click on New task, and select as Task "Delete classified ads" with the number of days you want. For example:
For example, we'll create a task that runs every day at 2am and deletes all classified ads created more than 30 days ago.
In this way, we have an active task that removes classified ads: