Addressing the "Logan's Run" method of tire maintenance....
Assuming for the moment that most tire failures are the result of age, say five years then KABOOM!
Why then is the solution to simply dispose of all these tires
into landfills with 70% tread?
Why then has there been no demand or outcry for a better product?
The industry standard is a somewhat more reasonable ten years for carcass life before they refuse to remount.
I maintain that proper tire maintenance (pressures,and inspections) is far more valuable than holding a purchase receipt in one hand and a calendar in the other, then comparing one against the other.
The chance of longevity alone causing a catastrophic tire failure in the first ten years is no more likely than buying a defective carcass and experiencing a similar failure right away.
One more question...
What percentage of tire failures which are now blamed on age are really the result of low pressure or road hazard?
No one can say for sure... so better check the condition and pressure, as well as the age of the tires
, of every bandwagon on which you choose to jump. (also the "gravitas" of the other passengers!)