Mandy Patinkin was 24 in The Big Fix when he played the character 'Pool Man'.
That was over 46 years ago in 1978.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 71, and has starred in 56 movies in total, 54 of those since The Big Fix was released.
In The Big Fix, I think Mandy Patinkin looks: