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>'; } }