How to be a 68-year-old SUPERMODEL! Runway star and mother of Tesla electric car billionaire Elon Musk reveals that she let her hair go grey and saw her career skyrocket With less than three weeks to go until New York Fashion Week, Maye Musk might be expected to be showing a few nerves. After all, the 68-year-old will be sashaying down the catwalk with models far, far younger than she is.