That was over 25 years ago in 1996.
Today he is 84, and has starred in 75 movies in total, 20 since Mars Attacks! was released.
In Mars Attacks!, I think Jack Nicholson looks:
Mars Attacks! scores 6.1 out of 10 on The Movie Database.
Jack Nicholson's first acting role was as 'Jimmy Wallace' in The Cry Baby Killer, released in 1958 when he was 21.