That was over 31 years ago in 1990.
Today he is 66, and has starred in 113 movies in total, 95 since Die Hard 2 was released.
In Die Hard 2, I think Bruce Willis looks:
Die Hard 2 scores 6.7 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.