Set noindex page-comment from Pages 2, 3 and More?

function noindex_comments_pages()
{
    global $cpage;
    if (!empty($cpage) && $cpage > 1) {
    echo '<meta name="robots" content="noindex">';
    echo "\n";
    }
}
add_action( 'wp_head', 'noindex_comments_pages', 9 );