Episode 24 of "Futurama"
s02e15 A Clone Of My Own

It's Farnsworth's 150th birthday, and a party is being held for him at Mars University. However the party makes him realize there is so much he has to do, and so little time to do it. Back home, he reveals his clone, Cubert Farnsworth, who looks and acts like an obnoxious 12 year old brat. The crew soon takes a dislike to Cubert. Farnsworth is crushed when Cubert tells him he doesn't want to be a scientist because Farnsworth's inventions never worked. Farnsworth decides to end it all, so he calls the Near Death Star. Anyone over 160 goes there for the rest of their lives, never to return, and it turns out Farnsworth has been lying about his age to avoid going there - he's really 160. When the crew find out, they, along with a reluctant Cubert, go off to rescue him...