My Charger tires ( Goodyear) were right at 18 years old when I sold it. They looked good with no signs of aging. I could feel an uneveness at highway speeds that was not normal for the car. I told the buyer to put tires on it ASAP.
My 38 went 21 or so years and I decided to change them just because of age.
both cars probably had 5-10K miles on them.
twocents beer

Just thinking about the two cars, the Charger saw daily driver duty for the first 1-1/2 years and was parked outside in Ca.. They 38 was a garage queen that the Charger joined after our move. May have had some impact on the Chargers tires shruggy