Here's another thought to add to this thread...
I consider Elon Musk as having potential to be one of the greatest investors (if not the greatest) in our generation. And he's only 43 years old.
I was thinking about Warren Buffett earlier today and observing how lots of people made a lot of money by sticking with Buffett for all these years with Berkshire Hathaway stock. If Buffett would have retired or passed away in his 60s, then it most likely wouldn't have worked out as well for Berkshire Hathaway shareholders. But Warren Buffett is 83 years old and still going strong. He just loves what he does and he's really good at it. And the fact that he's been doing what he's doing for so long has led to some incredible compound growth over the years.
So, what if Elon Musk turns out to be one of the greatest, if not the greatest, investor in our generation. And what if he lives and is still active until 83 years old (ie., like Warren Buffett). And what if people invested large portions of their assets in his companies when Elon was 43 years old (his current age) and held on for 40 years. I wonder what that would look like. What kind of returns would they have?