My Dad died of Motor Neurone Disease, at about Jonny's age.
Craig's remark brought back a bit of the sadness, during a show which I watch for a bit of lighthearted fun.
It's not what I expect of Craig, I think he must have said it without thinking.
We know Jonny isn't going to be as physically controlled as he would have been at 40, we don't really need it spelling out for us and illustrating with an example of something other than being in your 70s that could cause you to be a bit unsteady.