Sigmund Freud/25 Alexa Dell, the daughter of computer magnate Michael Dell, once posted an image to Instagram of her younger brother aboard the family's private jet. The "Rich Kids of Instagram" Tumblr blogged the image, and it went viral. Dell was forced to leave social media after exposing her family to security risks. Dell, now a 24-year-old startup advisor, has advice for teens on apps today. Alexa Dell, 24, is the daughter of tech billionaire and entrepreneur Michael Dell.