Ain't dead yet.....
This is in my Ford Owner's Manual:
Age
WARNING
Tires degrade over time depending on many factors such as weather, storage
conditions, and conditions of use (load, speed, inflation pressure) the tires experience throughout their lives. In general, tires should be replaced after six years regardless of tread wear. However, heat caused by hot climates or frequent high loading conditions can accelerate the aging process and may require tires to be replaced more frequently.
You should replace your spare tire when you replace the road tires or after six years due to aging even if it has not been used.
Where did the 10 years come from? Ford says 6 years (and even sooner in Texas, Louisiana, Mississippi, Florida, or other "hot" states)...
