Certainly some bands transcend their era better than others, but I think people throw around "dated" as a pejorative too much in music debates, conveniently excluding the older bands they themselves like. Whether an old band sounds fresh and exciting to you is mostly about what kind of music you're into. For example, if you like heavy metal, an obvious product of the eighties like The Number of the Beast could blow your mind. Or you might think it sounds a bit lame compared to Meshuggah.
If a band is still widely know decades after they broke up, it feels a bit pointless to talk about whether they're dated or not.
If a band is still widely know decades after they broke up, it feels a bit pointless to talk about whether they're dated or not.