George Clooney was 20 in And They're Off when he played an uncredited character.
That was over 42 years ago in 1982.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 63, and has starred in 86 movies in total, 85 of those since And They're Off was released.
In And They're Off, I think George Clooney looks: