My band plays fifties, sixties, seventies, eighties, nineties and today, and we just keep it the most rocking tunes of each era. We are constantly told that is not in, and we might as well play VFW's, etc, but every time we play a show, to any ages, we seem to win over the crowd.
Bottom line is, if you play the songs well, and really sell them, you can play anything. Never try and figure out what is in demand, because demand changes, and you don't want to get caught "behind the trend," as in practicing six months to play what was popular when you started rehearsing, but now the scene has changed.
Play what you can really play well, and enjoy playing, and you can book.