A nice older crowd, place for dining and dancing is Dominic's Italian Bistro in Sun City. Excellent Italian food and excellent nostalgic (Frank Sinatra, Dino, 40 thru 70's) music to dance to.
And by the way there are nice (on the more mature side) places to go eat and dance, like the American Italian Club, Chances Are, American Legion. You just have to look for them becaus they are there!