2 Separate Blowouts on RV Yesterday. Learned Important Lesson on Tires

What happens to race tires as they age ? The rubber gets hard. Hard means less flexibility, and less traction. Rubber ages and hardens. A tire is not round when under load. As it rolls it changes from flat in the contact area to round and distorts with rpm. This flexing causes heat to build up in the tire. The faster you go, the more heat the tire generates. Heat is what destroys rubber, oil, fluids etc... heat is almost always the enemy of endurance.
Instead of telling stories of what you got away with, for everyone's safety, replace them at least every 5-6 years.
Weather is also a factor. Hot climates are harder on tires than cooler climates.
Check your air pressure on a regular basis. And inspect you tires on the insides as well as the outside.