Sir Robin Hood, in close to a half century as a musician playing all kinds of music, I've found oldies will fill a dance floor no matter what the age group.
I can't get enough of them. I have my #1 and #2 dial on my radio set on oldies stations. I've always been a huge fan of American nostalgia and music from "back in the day".
Here's one of my absolute favorites: http://www.youtube.com/watch?v=FikmcDZVgPU
This one always gets me singing. The Rod Stewart version of the song is great too. They don't make songs like this anymore.
For me, it's a song called Deja que Mueva by Sonia and Selena. I have no clue what they are saying, but I can't hear that song and not start dancing, and dancing makes me feel good.
Pocketful of Sunshine by Natasha Bedingfield
Sweet Emotion by Aerosmith----reminds me of being on RocknRollercoaster
Margaritaville---makes me want to be at the beach!