Jared Harris was 26 in The Rachel Papers when he played the character 'Geoff'.
That was over 35 years ago in 1989.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 62, and has starred in 73 movies in total, 68 of those since The Rachel Papers was released.
In The Rachel Papers, I think Jared Harris looks: