That was over 23 years ago in 1998.
Today he is 66, and has starred in 113 movies in total, 71 since Armageddon was released.
In Armageddon, I think Bruce Willis looks:
Armageddon scores 6.5 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.