If you REALLY want to be safe you should buy a new car every 3000 miles.
My older brother tells me he can remember in the 50’s dad had to buy new tires every 5,000 or so. Dad was a salesman.
It is true that tires were very short lived in the fifties, generally speaking. Strangely though, my father bought a new F-1 Ford pickup in 1951 and ran the rear tires that came on the truck just past FIFTY thousand miles. No one had ever heard of such a thing. They were Dayton tires. It was probably twenty plus years before I ever saw another set of tires go that long and they were radials.
I have no idea why those two tires lasted that long but I know it happened, the front tires held up well but they didn’t last nearly as long as the rear tires, that is not unusual. I don’t think the tires were ever rotated on the truck, that just wasn’t something that was commonly done back then.