"Cool" definitely has persisted. Things were cool back in the 50's, for cryin' out loud. Things were still cool in the 60's, 70's, and on to today.
Meanwhile, things have been rad, def, phat, groovy, fine, and fresh, but they aren't anymore. There are other examples.
Another one that's been around a while is "sweet". Things were sweet back in the 70's, maybe even before. Things can still be sweet now. Things have been awesome since the early 80's or so, and that's not bad.