Elon Musk is one of the world's richest people, but he didn't grow up wealthy, according to his mother Maye: She says she had to scrimp, save and hustle to raise him and his siblings after her divorce. "Anyone who knows me says they don't envy my life. I've just been through very hard times," Maye tells CBS News in a recent interview. "I had to pay the rent, I needed a roof over our head and food for us to eat."

At 70, Maye is a model, nutritionist and full-time fan of her three grown entrepreneurial kids, Elon, Kimbal and Tosca but, for many years, modeling was a way to make money and maintain her family. She says she did it "to survive." And at one point, she had to work a total of five jobs: "I was a research officer at the University of Toronto. I was teaching two nights a week at a nutrition college and two nights a week at a modeling agency. I modeled and I gave talks, and I had a private practice," Maye tells Forbes.