That was over 65 years ago in 1956.
Today he is 90, and has starred in 109 movies in total, 108 since Heimliche Ehen was released.
In Heimliche Ehen, I think Armin Mueller-Stahl looks:
Heimliche Ehen scores 0 out of 10 on The Movie Database.
Armin Mueller-Stahl's first acting role was as 'Norbert' in Heimliche Ehen, released in 1956 when he was 25.