Allows you to stop displaying links for old comments. PHP 5+ required.
Expire Comment Links was inspired by Joost de Valk in an article he wrote called Comment links: an experiment. It all started when Matt Cutts talked about how Google changed how it handles no follow links in his article on PageRank Sculpting.
No one knows for sure yet if this will be beneficial or not, but for those that want to be on the cutting edge and try this experiment for themselves, this plugin automates everything.