If you are using the main search function rather than the search box within each forum, there is a drop down menu below the text box that allows you to select "Message Date" as the sorting method. You can then choose ascending or descending. Presumably, you will want "descending".

Is there a way to sort search results by date? Looking for information on cars and stuff from 2008 doesn't really help much. I'd guess many other searches have expiration dates too. Thanks!