Joaquin Phoenix was 8 in Backwards: The Riddle of Dyslexia when he played the character 'Robby Ellsworth'.
That was over 40 years ago in 1984.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 49, and has starred in 58 movies in total, 54 of those since Backwards: The Riddle of Dyslexia was released.
In Backwards: The Riddle of Dyslexia, I think Joaquin Phoenix looks: