Sort Products By Popularity within a Timeframe (Example: "Last 90 Days")

Hello,

I was wondering if there was a way to set a timeframe for when you sort your products (within the product slider) by popularity. I have a 3 year old store, so many of my older products that are not near as popular now, are still hogging up all of the top spots because they have been around far longer then my more recent best sellers. Is there a way to adjust the time frame used when you Sort By Popularity?

Thanks for all of the help!