John Stamos has taken a walk down memory lane! The Full Houseactor shared an adorable throwback pic with his tiny former co-stars Mary-Kate Olsen and Ashley Olsen, now 34, who were just toddlers at the time. “#TBT In honor of @disneyland opening soon!” the 57-year-old captioned his March 26 post, which showed the trio smiling alongside Mickey Mouse at the popular Los Angeles theme park in the late ’80s or early ’90s.