By Alexandra Abumuhor On Dax Shepard's latest Armchair Expert episode, the 47-year-old revealed that he dated Ashley Olsen almost 15 years ago. Shepard made the revelation with his co-host Monica Padman, ''She’s just the most wonderful person. She’s fantastic,'' Dax referred to Olsen. ''When we were dating, it was when she was putting all her energy and focus into launching that in a big way, so, I was able to ...