Several years ago,major tire rebuilders/retreaders stopped accepting tires more than ten years old for retreading citing too many " catastrophic failures". For those old enough to remember,20 years ago,the highways were littered with blown heavy truck tires. Today,not so much.
Also,DOT inspections now can "red flag" a commercial vehicle with a tire or tires more than ten years old.
In my state-Pa-ALL vehicles must pass a yearly inspection. And part of that inspection is that the tires on ALL vehicles must be under Ten years old. Two years ago,I had to replace nearly new tires with no weather checking at all,on a cucv pickup I had. I was not happy.
several years ago,I borrowed a friends 5th wheel rv to take on a trip out West. It had brand new old tires. I blew one and on inspection of the others,they were all coming apart,so I had to replace them all.
we could argue back and forth and I'm not in favor of government telling me what to do. But when the retreaders stopped accepting my 10 year old casings,my tire problems came to an end on my heavy trucks.
just my 2 cents