Alice Schwartz
Reported Net Worth: $2 billion
There are 70 years between the youngest person on this list of self-made women billionaires and Alice Schwartz. This 93-year-old became the co-founder of Bio-Rad Laboratories in 1952, along with her husband Berkeley. Nowadays, Alice still sits on the biotech firm’s board of directors and is its major shareholder, while her son is the CEO.