Net worth: $2.0 billion Age: 55 Source of wealth: pharmaceuticalsNet worth: $2.0 billion Age: 72 Source of wealth: frozen foodsNet worth: $2.0 billion Age: 66 Source of wealth: real estateNet worth: $2.1 billion Age: 67 Source of wealth: investmentsNet worth: $2.9 billion Age: 71 Source of wealth: palm oilNet worth: $2.9 billion Age: 61 Source of wealth: investmentsNet worth: $3.1 billion Age: 66 Source of wealth: real estateNet worth: $3.3 billion Age: 67 Source of wealth: hotelsNet worth: $3.3 billion Age: unknown Source of wealth: restaurantsNet worth: $3.4 billion Age: 76 Source of wealth: electronicsNet worth: $3.7 billion Age: 80 Source of wealth: real estateNet worth: $6.5 billion Age: unknown Source of wealth: real estateNet worth: $7.1 billion Age: 91 Source of wealth: bankingNet worth: $10.5 billion Age: 93 Source of wealth: paintsNet worth: $12.2 billion Age: unknown Source of wealth: real estateNet worth: $12.3 billion Age: 38 Source of wealth: FacebookNet worth: $16.4 billion Age: 50 Source of wealth: restaurants