Some of the older people start sort of just saying the words versus actually singing them. I hope he does okay.
Life is hard on vocal chords. Hard to keep a singing voice.
Shirley Bassey was still pretty impressive in 2007..about 70 years old here ... but don’t know if some of it is background track
https://www.youtube.com/watch?v=UT1yUAn0Bv8
A year or two ago I heard a clip from a live concert Neil Diamond had done and his voice was totally gone.......