It's unknown, but in the Prequels he had to be about 60, which makes him in his late 70s or early 80s in the Original Triology.
His name was Palpatine.
Hit enter and type darkside and you will get the Emperor.
Darth Plagueis is the emperor before in star wars.
EMP666 is the code for the emperor
Get invincibility
palpatine
The Emperor
Star Wars: Knights of the Old Republic was made before Star Wars: The Old Republic.
Chancellor Palpatine/ The Emperor
the emperor stikes back
Emperor Palpatine
Mainly Emperor Palpatine