Champion Window has been making vinyl windows; pure virgin vinyl PVC since the 1970's, beginning with aluminum windows in 1953, and Champion still makes the same quality vinyl window today.
Pure vinyl will last a life time. Other windows made with cheap filler additives such as wood pulp, clad or fiberglass is what has given "vinyl" a bad name. Bad vinyl will fade, shrink, warp and crack in the weather. Pure and more expensive to make vinyl windows by the Champion factory will last a lifetime.