I have a car with Michelin Destiny tires that will soon hit 10 years old. The car is always garaged and the car is almost never left out in the sun and has never seen snow. There is 80% of the tread left with very low mileage. I'm just wondering about the general rule to replace tires at 10 years of age. The dealer won't rotate and balance them after 10 years based on the date stamp on the tires. Would you keep the tires or buy new ones?