I buy all-weather tires in the fall and run them for 2 or 3 years depending on wear.
Maximum safe tire age is 7 years regardless of how much tread is left. The date of manufacture is stamped on each tire, in a secret code of course but you can google it.
There was a bit of a scandal a few years ago when someone noticed their tires were already over 2 years old when he bought them.
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