Found this while researching info about a trike--hope this answers some questions. Hope that is right--It wasn't try again-- CarBibles.com
For some stupid reason it doesn't come up as a url for me either but by typing in (CarBibles.com) I am able to access the site. Information about a lot of car related stuff besides tires.
http://www.carbibles.com/tyre_bible.html it says--- you should never use tyres more than 6 years old. The rubber in tyres degrades over time, irrespective of whether the tyre is being used or not What crap!
The URL doesn't seem to work to link up but just typing (CarBibles.com) links up. Sorry,but it is worth the read.I'm thinking it was done with the dumb joke page on purpose for some reason.They do sell printed versions of the pages,so maybe that is why the link is not working. They list brakes--suspension(bikes too) oil & other stuff,but the tyres section lists a lot of info that everyone is always asking about.
I'm sure the information comes from the tire industry & they are going to cover their asses from a liability standpoint--- Most everything we all do with motor vehicles is done with some sense of correctness but without strictly following all the rules as stated by those that make the rules. This isn't Moses bringing down the tablets--just information that isn't always on hand when you need it.
Tire storage has alot to do with the life span of tire rubber. Sun light, ozone and heat will kill rubber. Tires should be stored in a dry cool place and away from any electrical devices that create ozone, ie. electric motors. Don't store them in your garage attic or stack them next to your shop compressor. Best way to store is stick them in garbage bags and put them in the house crawl space or basement. White wall tires need to be stacked white wall to white wall to prevent discoloration. Garaged vehicles will preserve tires much longer than those stored outside. Seldom used vehicles stored outside, ie. motor homes, car trailers, etc. should have tire covers to protect from sunlight (ultra-violet light). That's why you will frequently see motorhome tires covered in storage lots. Tire manufacturers have time limitations on how long tires can be warehoused before being purged from inventory. Some tire companies scrap them, but most will sell obsolete stock at greatly reduced prices in bulk to tire brokers. Most are shipped by container loads to be marketed in third world countries. The places on the face of the earth where there isn't a small army of lawyers.
The spelling "tyres" makes me think it's UK-based info. Their climate is much different and it could make sense. But I've used tires on trucks and plows that were pushing 30 years old.