Jackie Earle Haley

Was actually only 17 years old when he played 19-year-old Moocher in Breaking Away (1979); he was the only teenager of the group, as co-stars Dennis Christopher, Dennis Quaid and Daniel Stern were all in their twenties.

I started acting when I was 5 years old. And I was pretty well known for a while. Your self-esteem and your identity start to become wrapped up in that celebrity, and when that starts to fade away, your self-esteem and your identity start to fade away with it. Those roles that I played and the success that I had, that is not who I am. It's part of who I am, but it's not everything. So when it drifts away and you start to feel increasingly insecure, it's kind of a long battle out of that.