Woah - that's a tough call. You have tapped into the age group that many of us entertain on a regular basis, though - so maybe you can draw from our experiences.
That crowd includes the parents and children that followed WWII. In the US we refer to the younger set as baby-boomers, and their folks as the swing generation.
Classic standards, Motown, early Rock & Roll, and big band tunes will all be appreciated. If you want to play favorites - include:
Sinatra, Diamond, Streisand, Miller, Dorsey, Ellington, Gerswin, Porter ...... that stuff. For a sample of some of my most frequent requests - check out my site. http://members.aol.com/unclemusic/
Have fun ! That's a good crowd. They grew up dancin' their socks off.