Last post with author's image

I have the following code which is supposed to pull the last post with the avatar photo on the front page.

<?php $types[0] = 'post';
       $types[1] = 'page';

          foreach ($types as $type) {
            $args=array(
              'orderby' => 'date',
              'order' => 'DESC',
              'post_type' => $type,
              'post_status' => 'publish',
              'posts_per_page' => 1,
              'caller_get_posts'=> 1
              );

                $my_query = null;
                $my_query = new WP_Query($args);

  if( $my_query->have_posts() ) {
    echo 'Latest ' . $type ;
      while ($my_query->have_posts()) : $my_query->the_post();
       echo get_avatar( get_the_author_email(), '80');
       the_date();
       the_content();
    endwhile;
  }
} wp_reset_query(); ?>

It does but posts_per_page => 1 doesn’t really seem to work as I get a post and a page? I only need the last post. Any suggestions please?

Removing $types[1] = ‘page’; doesn’t work, using $types = ‘post’; neither.