I saw them on the Nostrodamus tour and he was walking around with a really big cane (ie: more like a staff) and I thought it was just a prop at the time, but I've seen him with a smaller/shorter cane in quite a few videos lately.
Dude is over 60 yrs old, so I guess he's earned the right to start falling apart (if that's what it is). I know guys a lot younger than him that have been using a cane for years.