WordPress – Showing Ads only on Old Posts

Thanks to Viper007Bond for, quite literally, showing me how to do this!

Advertising on old Pages and Posts

If you want to show ads to readers on posts or pages that are of a certain age, just place the code below in either your single.php or page.php file.You can use your judgement as to where you want the ad and what size it will be. Remember, change the amount of days, I have it set to 30 in this code.

<?php
    if ( get_the_time('U') < strtotime('-30 days') ) {
        // show ads
    }
?>

WordPress Plugin

I am thinking of adding as a feature to my Advanced Adsense Plugin for WordPress or maybe I will just create a seperate one.