The 46-year-old actor who set hearts racing as E.R.'s Dr. Doug Ross in 1994 is gradually becoming a head full of grey hair. And to hide his grey locks, the Michael Clayton star is contemplating dying his hair. "I will have to consider it (dying my hair). I've been thinking a lot about it lately," he is reported to have said. "First I'm gonna start dyeing my eyebrows, just to see how it works.And then I'll go to the hair. Start slowly, with the eyebrows," he added.