I was recently planning on quitting vaping, so I let my supply of e-liquid slowly run out. And then, when I was down to a bottle or two, I changed my mind and ordered some more of my old standby for the last five or so years, Goodejuice's RY4. But I live outside the US, so shipping can take a long time. And to make matters worse, customs struck for the first time ever, and demanded a prescription for my e-liquid. I actually got the prescription and sent it in, and... that was three months ago. Seems my order is stuck in limbo. Meanwhile... gotta vape! So I happened upon a box with old e-juices that I couldn't bring myself to throw away, but which I hadn't wanted to vape since finding my gold standard daily juice. I had purchased them all in late 2013. So... 6-year-old e-juice! Not appealing, but better than nicotine withdrawal, and way better than smoking again. My findings? None of the e-juices were appreciably darker than they were after the first 6-12 months I had them. It seems that darkening process (perhaps oxidation) happens once, fairly early on (by my standards, at least), and then stops. None of them were noticably thicker or gooeyer than they had been either. So I started vaping them. They included juices from Ahlusion (Caramel Pear, Vanilla Wildwood, Maple Wildwood, Ginger Apple Tea and some others), Goodejuice (RY4, Patriot Tobacco, Apple Shisha), Alien Visions (Chocolate Mint, PG Chai, Strawberry Shortcake) and Mt Baker Vapor (scads of fruity things). And much to my surprise, they were all pretty much as I remembered them from years ago. The Goodejuice RY4 was still marvellous, while their Apple Shisha was okay and their Patriot Tobacco struck me as unpleasant -- just as in 2013. I actually took a great liking to the Alien Visions Chocolate Mint and Strawberry Shortcake, even wondering why I hadn't kept vaping them long ago. PG Chai continued to be... odd. The Ahlusion juices still had an indescribable taste that I found unpleasant both then and now, though now they also coated my tongue with what felt like a sickly sweet layer of oil -- so much so that they made we want to brush my tongue. And Mt. Baker Vapor... well, that stuff is indestructable. And most of their juices don't even seem to darken with age. It's the same middle-brow stuff I started off on. A working man's e-juice. Finally, not one of these juices seemed to have lost their throat hit at all. Alien Visions Strawberry was weak in this department, but I remember it being weak back then, too. So if there's a moral to this story, it's don't throw out your old juices! They'll be just fine. Hell, maybe your kids will be able to vape them one day.