What is anybody's hypothesis as to why these old geezer rockers just can't get off the stage? Phil Collins performing in a chair. Ozzy? The Rolling Stones?
Are these guys as psychologically addicted to the adoration of screaming fans today as they were physically addicted to drugs decades ago?
Why not go out at the top as a jumping rockstar maniac, instead of having your fans remembering you as an elderly and feeble octogenarian sitting in a chair?
And Elton John, Rod Stewart, etc... U2, Radiohead, Oasis creeping into this zone as well...
After buying a "record player", my first album purchased was Captain Fantastic (wore out the grooves on that one!) and the first album I lined up for upon it's release was Rock of the Westies. Just entering my teens, this set me on my path with Supertramp, Rod Stewart and the like holding a special place in my music memories.
I never did get into Metal, but definitely considered Black Sabbath the originals, with Zeppelin in the mix between metal and English blues based rock. FWIW and IMO, ACDC falls into the same hard rock camp as GnR, etc.
I agree as others have stated, this group of performers love to perform. They are in their element and, at this stage of their careers, absolute consummate professionals. One of my favorite live shows ever was Sting with Peter Gabriel a few years ago. They were thoroughly enjoying themselves, and 18,000 of us were totally on board for the ride. My biggest regret was missing Elton John's Farewell Yellow Brick Road tour stop. I chose, for the reasons Ron stated, not to attend. What a mistake, for me personally.
On the topic of money, probably can't be overlooked, as this level of performer/artists are essentially corporations with massive teams behind them. I'm sure some get pushed into it, but my guess, as I note above, is that the performers are there because it what they love to do, and the stage is a very energizing place for them.
RIP Ozzy. This is a great thread. Bringing up all sorts of memories!