You should have a hyperlink for delete action.
<a href="https://stackoverflow.com/questions/50769173/delete.php?id=<?php echo $row->id;?>"> Delete Record </a>
Here it appends record ID in url and it looks like
Now you want to delete previous 14 records.
$currentId = $_GET['id'];//got from URL $nextLimit = $currentId - 14; //in case of next 14 you need to add
Your SQL Query should be:
$query = "delete from table where id between '$currentId' and '$nextLimit'";
and execute the query.