In the market next spring. Agree on the Tire Rack, and heavier load rating being ok.
I drive so little now, that I never run out of miles or wear. My tire guy told me to replace them at 6 years either way, as they wear out based on age, too. But I think he's trying to sell me tires. I looked at them closely, at the time, and they looked perfectly fine. Until now, as I'm starting to see very slight signs of cracks here and there. Time to replace them, I guess.