That was over 33 years ago in 1988.
Today he is 66, and has starred in 113 movies in total, 103 since Die Hard was released.
In Die Hard, I think Bruce Willis looks:
Die Hard scores 7.5 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.