The tubes don’t necessarily wear out but I had the joint at the valve stem on a butyl tube separate when I hit a pot hole. The tube was a Specialized and almost 5 years old and was in a GP 5000. I find this tire/tube combination to be really reliable on our crappy Michigan roads. I now replace the tubes after 4 years.
Fair enough. That’s never happened to me on butyl tubes. However, I ought to disclose this: it’s happened several times on Vittoria/Silca latex tubes, and it’s happened within the span of about a year.
I believe that I’ve determined that this is user error, although it seems not to be a well-documented issue. The cause is that when you press on a pump chuck, this can push the valve stem inward. For unknown reasons, this flexing seems to wear a couple tiny holes around the valve stem, usually just outside the region where Vittoria bonds on a rubber (butyl?) patch to protect the latex tube against abrasion. It seems like you have to hold the tube steady so that it doesn’t move so much when you put your chuck on.
Alternatively, you could use a screw on chuck like Lezyne does. Or you could use one of those valve stem nuts that we typically throw away … except that Vittoria tubes don’t have external threads on their stems. So I can’t do this on my road bike with its usual wheels, which are 30mm and don’t need valve extenders. I have Silca’s speed shields on my ‘race’ wheels, and those do come with a little nut to thread on to the extender, but again, that won’t work on my daily wheels.