My mother has rheumatoid arthritis. I don't want to lose the ability to jump up and walk across the room or move around with the energy I'm used to having. That's far more important to me than a wrinkle or two.
In the UK and the US especially you've got a lot of throwaway artists who have their 40 million dancers and they do their show. There's many artists who would not do a live show because they know they can't.