Sold as new a 3 year old tire! 3 year old tire that hasn't been installed still isn't new. Not a problem if upfront and not a snake about it then reduces price. Tires should be changed every 10 years, I always loose my tires to old age not treadwear!
Last 3 sets of tire bought for 3 Different vehicles have been the Arroyo Brand. My experience they say 55k mile tires. Your gettinf 55 k miles out them tires.