Is The Age of a Tire Important ?

Youbetcha !..The National Highway Traffic Safety Administration

(NHTSA) recommends that any Tire  SIX YEARS OLD or older

should be replaced ,  regardless of Tire depth. This means that tires

that look almost like new but are 6 years or older should be replaced

because the NHTSA determined that age, not tread depth, was a

major contributor in tire failures.

Automotive Principles Technology - James D. Halderman  (1999 Edition)

https://www.edmunds.com/car-care/how-old-and-dangerous-are-your-tires.html 

https://m.tiretrack.com/tires/tiretech/techpage.jsp?techid=11 

https://www.popularmechanics.com/cars/cars/a4047/how-old-are-yourtires-15441034/ 

https://www.sokule.com/blog/cbarkwell