That was over 35 years ago in 1986.
Today he is 52, and has starred in 89 movies in total, 84 since The Name of the Rose was released.
In The Name of the Rose, I think Christian Slater looks:
The Name of the Rose scores 7.3 out of 10 on The Movie Database.
Christian Slater's first acting role was as 'uncredited' in Sherlock Holmes: The Strange Case of Alice Faulkner, released in 1981 when he was 12.