Last year at the home my mum went to occasionally for Respite Care, the residents got most upset at the fact that the songs the visiting musicians were playing were (with the exception of 2 or 3 people from my mum's generation...she was then 94) songs from their parents' generation.

I think the current crop would be looking to hear songs along the lines of:

Johnny B Goode
Unchained Melody
Rock Around The Clock
Only You
At The Hop

etc.

Give it a few years and they'll be requesting Dylan, Neil Young, Stones, etc, numbers.

:-)