So much for Maxxis tires

I recently had two Maxxis tires suffer tread separation. In April 2015 I purchased a used 2004 Hybird TT as a handyman special. At that time I looked at the tires and they appeared to look like new. And when checking the date on the tires I misread the date. On Aug 23, this year I drove about 80 miles to the campground and when I arrived I noticed that the front roadside tire started to separate. I replaced it with the spare and it was then that I noticed that the tire had a Mfg date of 1803. The tire was over 12 years old. I towed the TT back home and then on 9/11/15 I made another trip to the campground and again after I arrived I noticed that the rear roadside tire had suffered tread separation. I had another spare along. I replaced the tire but this time I felt I should not tow the TT back home. I placed the TT at a local storage place. After arriving home I ordered 5 New Maxxis 185 80R 13 tires. Looking back I know I should have replaced the tires when I purchased it. However I made a bad assumption and only looked at the tires and misread the date on the tire.
However my feelings toward Maxxis tires is even due to the 12+ year age of the tire they held up and didn't do any damage to the TT.
The original tires were well past their useful life. They showed no signs of cracking. Also the original tires were Made in China The new tires are marked Made In Thailand. Not looking to get 12 years from this set but I feel very comfortable that I will get at least 6 years from them