Armin Mueller-Stahl was 24 in Heimliche Ehen when he played the character 'Norbert'.
That was over 68 years ago in 1956.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 93, and has starred in 113 movies in total, 112 of those since Heimliche Ehen was released.
In Heimliche Ehen, I think Armin Mueller-Stahl looks: