I ran a search here (i.e. age, old, aged), but didn't find much on this topic. Some might say this is "scare tactics" journalism, but I think it's valuable information knowing just how "new" your tires really are. Something to be aware for that next purchase.

Here's the vid from the ABC report that ran this past summer...
http://abcnews.go.com/Video/playerIndex?id=4826897

How to Determine the Age of a Tire...
http://www.tirerack.com/tires/tirete....jsp?techid=11