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According to the Bloomberg Billionaires Index, each of the following Americans had a net worth of more than $10 billion and less than $40 billion as of March 2018: Jack Dorsey 44, co-founder of Twitter and Square Thomas Peterffy 75, founder of Interactive Brokers Carl Icahn 85, founder of Icahn Enterprises

Mean wealth is the amount obtained by dividing the total aggregate wealth by the number of adults. Median wealth is the amount that divides the population into two equal groups: half the adults have wealth above the median, and the other half below.

In the 29th annual Forbes list of global billionaires, a record 1,826 billionaires were named with an aggregated net worth of $7.1 trillion compared to $6.4 trillion in the previous year. 46 of the billionaires in this list were under the age of 40. A record number of 290 people joined the list for the first time, of whom 25 percent hailed from ...

In 2007, at age 23, he became the world's youngest self-made billionaire. As of March 2022, Zuckerberg's net worth was $74.5 billion according to the Forbes ' Real Time Billionaires.