Tire mfg date code/sales

Some of the big tire chains will not mount or balance any tire 10 years (or more) old. Afraid of law suits (they say). I think its just a scam to sell more tires. Because not every 10 year old tire is ready to explode. Some cars sit outside 24/7/365, while others are only driven in nice weather and live in a nice garage. Obviously, the tires that are outside are going to age much faster than the pampered ones.
I have had issues just getting new tires mounted and balanced. Bought two new tires (165x80-R15) for the front of the race car. Could not find any place willing to mount them on Centerline wheels. Did find one place that dismounted the old tires. I had to mount the new tires by hand, then found another place to balance.
Of course I had sold my Coats 20-20 tire machine last year. Another time I could not get a tube installed in the spare for my trailer, Very small rim leak. Said a safety issue, but they sell used tires, "no warentee ". Go figure.