The Rolling Stones touring again...don't they know when to quit?

I am hard core Stones but age takes a toll no matter what it looks like. Age catches up to everyone eventually, I guess they are just doing shows because they love the whole thing in doing shows or they are just trying to make their pile bigger for someone.
I've known a few people that wouldn't retire because they wanted to keep the money rolling in. Two have died before ever stopping to enjoy life. Workaholics or just gold fever, I dont need either.