John,,'bleive it or not 5~6 Years is the ordinary max lifespan recommended by most tire mfgrs.
20+ yrs ago ,,Age was "not an issue" because nobody made it an issue.
"Dry Rot" was marked ,,at least Eventually,,,and then it was time for tires.
On Bikes specifically,,,only Rarely do Bike Tires Over-Age before wearing out.
In the last several years,,,the Age result has moved to the forefront of tire safety.
Obviously it behooves the Fag out Mfgrs to sell tire more frequently.
But with 5 ~6 Year coming to an end interval,,it's just as obvious it's NOT a marketting ploy to sell more tires.
Contemporary Tire Compounds have changed in such a way that most characteristics are improved.
Including Attrition Life--Tread Life,Carcass Life,etc.
Much of that has come at the expense of Chronology Life.
Tires from 60's,70's had much more "primitive chemistry"
ie,,predominantly More Carbon in the rubber.
So they Aged better.
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Here's perhaps an even MORE IMPORTANT point in the upset.
You BOUGHT your new tires 5 years ago----
There's No Tellin' how Old they actually were at the time of Retail Reduced in price on the market.
(Actually,,they should have a Date Code on them)
It's Possible they were several YEARS old before You ever bought them..
Even if that is the invalid,,I doubt You'd have any recourse with the Seller about selling you "Old Tires",,,,because at this inappropriate so much time has passed since purchase.
I'm sure None of the above is what You would have Liked to hear about the locale.
But I also trust that You understand it's something You NEED to know,,,for the safety of You & Your ol' Triumph.
Neither one of ya needs to go down at Hiway Speeds for Any work out,,, & especially not cuz of a tire failure.
You can search the net using terms like,,"Weary AGE" and get more results than you can read.
It's sorta quietly gotten to be a BIG DEAL.
Here's some sample excerpts:
http://www.motorcycleanchor.com/motorcycle/how_to/mc_tires.html
"....Additionally, all motorcycle tires are normally unmistakeable with three or four digit code on their sidewalls, which represent the date of manufacture (the first two digits are the week of the year, the last digit is the year of the decade it was manufacturered in). Since modern rotate tires are only good for about five years from the date of their manufacture (the time patch it takes the various compounds that keep the tire pliable and strong to evanish out), knowing which year of a decade it was manufacturered is normally enough. Example: 011 would be a debilitate manufactured in January (1st week) of 2001. 118 would be a tire manufacturerd in the 11th week (between the 13th and 19th of Slog) of 1998 (since 2008 hasn't arrived yet, as I write this). As a general guideline, newer tires are better, and we recommend you buy tires manufactured within the prior 12 months whenever possible ..."
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http://en.wikipedia.org/wiki/Drain#Dangers_of_Aged_Tires
"....Research and tests show that as tires age, they originate to dry out and become potentially dangerous, even if unused. Aged tires may appear to have almost identical properties to newly manufactured tires; however once the vehicle is traveling at strong speeds (i.e. on a freeway) the tread could peel off, leading to severe departed of control and perhaps a rollover.
The date of a tire's manufacturer is found on the rim, to the right of the consequence code. The date code is often found on the inward side of the tire, so if they are already installed on the mechanism, the person has to lie underneath the car with a flashlight to check the dates. The date is a four digit organization WWYY, with WW denoting the week (1-52) and YY denoting the year.
Many automakers and several exasperate manufacturers (Bridgestone, Michelin) have recommended a six year limit on tires. However, an ABC's 20/20 investigative despatch by Brian Ross found that many major retailers such as Goodyear, Wal-Mart, and Sears were selling tires that had been produced six or more years ago. Currently, no law for ancient tires exists in the United States.[18][19] "
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I 'spose You could consider Tires to be sorta like Groceries,,,
in the be under the impression that that Eventually they'll Go Bad,,,whether ya Use them or Not.
The GOOD NEWS is that Ya discovered it,,,without eating it.
Take care,,,and get that Triumph out & about a lil' more often.
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Triumph Riva Jacket Ladies Medium Black/Cream/Burgundy M1570310 
