Maye Musk has been modeling for decades and doesn't show signs of stopping any time soon. We talked to the stunning septuagenarian during New York Fashion Week where she was still walking the runway. The mother of SpaceX CEO, Elon Musk, shared details about her new book, A Woman Makes a Plan: Advice for a Lifetime of Adventure, Beauty and Success, her personal style and secrets for staying radiant at any age.