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There is no DOT regulation requiring that any tire be changed out due to its age alone. I really don't understand how that misunderstanding got started.
I am also passing "on information that is known to me to be endorsed by more than just my experience." Every single thing that I have expressed in my post is based on DOT and even stricter FMCSA regulations.
I did not "express an opinion known to me to be contrary to widely followed government and industry guidelines." As a matter of fact, the opposite is true.
It is very misleading to insinuate that there is somehow a legal issue by using the phraseology "government and industry guidelines" requiring the replacement of any tire due to it's age alone. This regulation does not exist. It's hooey and was made up out of thin air. There is absolutely no regulation by any government agency that requires that a tire be replaced due to its age alone.
By your definition of standards, a tire manufacturer would be liable legally if a tire sat on a shelf for more than 6 years before being sold! Where did this come from?

I actually do wear suspenders that are looped and my belt actually runs through those suspender loops and supports my pants. They stay up quite well with this arrangement :)