Quite some time as in, a decade or two, or quite some time like last year?
I know the discount tire near me wont mount tires over ten years old. When I went there to get a new pair for the front of the Regal I was going to get one of them mounted for a trailer tire so I brought a rim along. They told me that they couldn't mount them but gave me a killer deal on a new tire that they couldn't move that I am using for my trailer.
How old are they?