Right. The US Iowa Class battleship is pretty old too, but i still wouldn't want to engage it with just the 5" forward gun on an Aegis cruiser. The Aegis would end up a burning oil slick on the ocean.
Just saying that old doesn't necessarily mean not capable. i have NO idea what type of ships are in service in the DPRK navy, but i imagine that the ROK navy is pretty well equipped.
The real question here is whether Kim is still calling the shots in the DPRK.