I run in Vivobarefoot shoes - they feel pretty much the same when new and after years of running.
Also play various cutting/running sports (soccer, ultimate) and don't notice much of a difference between old and new shoes. My current turf shoes are about eight years old, with multiple games per week over most of that period.
Running shoes are garbage long before they fall apart or get holes in them. Perhaps you're lucky, but I can't imagine running in my shoes for more than about 350 miles. Nothing feels better than the first run in new running shoes.