Musk, 51, has been preoccupied with Twitter, the floundering social-media network he acquired last month for $44 billion.
The young and wealthy instead see more potential in assets like cryptocurrency, real estate and private equity.
Lili Buffett, 36, married Howard W. Buffett, the grandson of the billionaire investor, in 2011.
Jeff Bezos's wealth plunged by $9.8 billion, the most among those tracked by the Bloomberg Billionaires Index.
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