Windshield Wiper Blades

Today, I got new wiper blades from Napa, for my 69 Dart. They looked amazing, just like the blades I removed, that have been on since the 70's. Only problem, they have been in the package since 2002! If you're getting these, open the package in the store, and check the date. Does anyone have experience with ten year old, new wipers? Thanks.