I replaced the (Bridgestone) tires on my GF's car at 5 years. The tires actually still had good tread, and I originally questions the replacement but after the tires were off and a closer inspection, I could see very small cracks between the treads. These tires are probably just fine if you are only going to drive around town at 1-40 km/hours, but I certainly wouldn't trust them up on the freeway at high speed and getting hot.