Part of the issue - only about 200 of those billionaires are under 50. People can be "Tony Stark" after that, but I think its probably more likely that younger people will have the energy and willingness to invest the decades it takes to build large disruptive companies.
A non-negligible amount of wealth is inherited. Again, not to say that inherited wealthy aren't going to be making innovative companies - Tony Stark himself inherited Stark Industries. But I think the Elon Musk assumption is for serial ambition in entrepreneurship, which probably more likely comes from self-made people.
A lot of wealthy (and innovative) people like doing things behind the scenes. Like Tony Stark, but without the fireworks and cheerleaders.
Finally, as others have said, there are other people who have made multiple innovations on the scale of Musk - Edison, Tesla, Ford, Howard Hughes in the past, more recently Gates and Allen, Steve Jobs, Larry and Sergey. Maybe Zuckerberg and Dorsey are the next to join these ranks. And that is just in the computer and internet industries.
A non-negligible amount of wealth is inherited. Again, not to say that inherited wealthy aren't going to be making innovative companies - Tony Stark himself inherited Stark Industries. But I think the Elon Musk assumption is for serial ambition in entrepreneurship, which probably more likely comes from self-made people.
A lot of wealthy (and innovative) people like doing things behind the scenes. Like Tony Stark, but without the fireworks and cheerleaders.
Finally, as others have said, there are other people who have made multiple innovations on the scale of Musk - Edison, Tesla, Ford, Howard Hughes in the past, more recently Gates and Allen, Steve Jobs, Larry and Sergey. Maybe Zuckerberg and Dorsey are the next to join these ranks. And that is just in the computer and internet industries.