Guessing 25 years, maybe never? ..... '85 Ramcharger strikes again..

Did anyone else ever notice that a modern tire will fall apart when its 4 or 5 years old, but a 40 year old tire thats been under cover like that one will last until it wears out??
YES! I have 2 tires off the '62 Lancer, aka "my wife's pet Toad". Those damn things are E 70 or something, so that tells you how old they are. They will got go flat!!!! NO I don't drive them down the road though. Demo guys hunt those old biased tires!