>>3. Don't sing Victorian parlour songs and WW1 songs! Well, maybe just 1 or 2 occasionally.

Before my first such gig, at a club for older people where I was a volunteer driver, I asked advice from the people I was transporting to and from the club. One lady said to me, "Please don't sing us all those old songs from our parents' and grandparents' days, like lots of people do! Our generation likes Elvis and The Beatles!

Absolutely. We sang for some 'older' people at a local methodist hall and people came up and said "thank goodness you didn't sing Vera Lynne or war songs that was my parents generation. I was born in 1941 John Lennon was born before me and I learned to dance to Buddy Holly"