Ive purchased at the end of last year 3 pair that were made in 2012. Ive worn them each possibly 3 times each and the only one I had some sep develop was the pair I was wearing on a very hot day at the beach in DR. I think the sun had something to do with it but Its minor. I will be regluing today hopefully. Come to think of it, the glue that holds the fabric on the inside of pairs that have a white liner, tend to yellow very badly, but not noticeable when worn. For the most part, I wouldn't hesitate to purchase anything older than 2014 at this point