[MarkFL]

If you want a bold red message directly below the username in the postbit (assuming you have the online status next to the username), then create a plugin with the hook location "postbit_display_complete" with the code:

PHP Code:

if ($post['birthday'])
{
    $age = floor((TIMENOW - strtotime($post['birthday']))/31556926);
    if ($age < 16)
    {
        $post['onlinestatus'] .= '<div style="color: #FF0000; font-weight: bold;">User is ' . $age . ' years old!</div>';
    }
}