The tires on my Charger were 13 years old but looked great. I replaced them only because of age. They were 50% tread in the rear and around 80% up front.
Today the Wife had a blowout in her spare car. We rarely use it now except to cart the dogs somewhere. I looked at the date code......2006 ! What???
On close inspection, there are all sorts of tiny cracks everywhere. Good thing she wasn't moving fast.