That was over 41 years ago in 1980.
Today he is 66, and has starred in 113 movies in total, 108 since Ein Guru kommt was released.
In Ein Guru kommt, I think Bruce Willis looks:
Ein Guru kommt scores 0 out of 10 on The Movie Database.
Bruce Willis' first acting role was as 'Extra (uncredited)' in Ein Guru kommt, released in 1980 when he was 25.