Tire age

So at what age does everyone get new tires for good traction and safety?
Depends entirely on thorough visual inspection and knowing how the tires have been cared for IMO.

A current example: we have a 2013 Camaro now with 18,000 miles sporting the original Hankook 20” tires. Now 10 year old tires. We are the second owners. The original owner kept it in the garage as we do. The tires have born on dates of early 2013. The tire wear is even and the same between all four. No stress cracks, no hardening, no signs of color changing etc. Still soft and pliable no chunking or anything.
Like I said IMO, it depends. By all means if one is concerned about age then get a new set, absolutely nothing wrong with that at all. Just maybe sell off the others yourself vs. letting a tire shop steal them from you, and the shop manager possibly then selling them to his buddy with a rink dink garage that sells used tires for $10 and up.
I speak from my experiences, so as we all say: IMO.