You're very right. We're dealing with mostly rich old people who never cared about others while they were young and certainly don't now that they're about to die.

People like elon musk will be around for a good while longer and I think people need to not underestimate just how mentally ill these people are. They're not capable of caring about other people as much as themselve like normal people are. This is a key feature of sociopathic narcissism, and people like that are well equipped to traverse our economic system more successfully than anyone else because they have no morals or empathy holding them back. After enough decades of capitalism, the only ones on top are people like this and then it devolves into neo-feudalism.

If any billionaire regardless of age cared about humanity, they would use their massive power and influence to help humanity and they simply choose not to.