Add a class to past events

I have a block of coming events. The fields are Date and Title (linked to node). I show six events, with a 'more' option. I keep events on the list until they are fifteen days old (I like people to see what they've missed!). Is it possible to add a class to the title when it's older than 'now'? So in my example past events that occurred less than fifteen days ago show but I could style them differently than the future events in the list.

While I'm here - thanks for all your work on this module!