Automatic Delete post on a specific date

i want to display all posts as well as count the days of the post since it was published

if ($pageposts):
  foreach ($pageposts as $post):
        setup_postdata($post);
    echo '<p>';

   the_title();

   echo '</p>';
  endforeach;
endif;

Output should be something like this

Post Title1 – This post is published 4 days ago
Post Title2 – This post is published 3 days ago
Post Title3 – This post is published 6 days ago

and at the same time i want to delete the post once it reaches 10 days

I really need your help guys thanks i appreaciate it alot