I bought my first 1948 Chrysler in 1973, with the original tires on it, with 32,000 miles on them.
I drove it for 11 years with those tires and sold it with those tires still on it, about 70,000 miles. They looked worn.
Either Tires were made much better in the day, or tire companies encourage owners to replace them every 7 years or so. Why?
My 2001 Pick -Up Truck is on its 6th set of Tires with 302,000 they still have at least 10,000 more miles to go.
Don't buy into the tire hoopla of getting new ones just to have new ones unless they are really needed.
Its all just a caching thing. I'll be the first one to tell you new tires are nice, but with the price of them now - not so much.