Give it a try. Sometimes singers get better with age. I recently went (with some doubts) to see Jerry Lee Lewis put on a show in Biloxi. Having seen some popular stars in concert (Elvis, Ray Charles, Sammy Davis, Sinatra), I must say that the Lewis show was fantastic and the best hour of entertainment I've ever seen. Maybe Simon and Garfunkel will also surprise.
I have been to three Jerry Lee Lewis concerts over the years, unfortunately, he wasn't at any of them. He is not much more reliable than me.
So9