Here's Lou Christie singing his '65 hit "Lightnin' Strikes" at an appearance last year. I miss the back-up singers but isn't Lou in great voice? Wikipedia says he was born in 1943 so he was 76 when he did this performance and I think that's him singing live, still hitting those high notes. I worked once with a singer from his era who was unable to replicate the high notes on some of his big hits so they had to do electronic trickery when he performed in concert. Lou's still got it…
