Grumpy Young Men is the second segment of the 22nd episode of The Adventures of Jimmy Neutron: Boy Genius


To purchase a rated M video game, Jimmy, Carl and Sheen use Jimmy's new age accelerator to make themselves into 18-year-old's. Unfortunately, Jimmy's time barrier source causes them to turn into old men. As it turns out Jimmy did not use a proper amount of Titanium (placing a crushed soda can in the accelerator) They must find some titanium to change back to normal before 6:03 or else they'll turn into dust.


  • When they are old, Jimmy, Carl and Sheen will get Alzheimer's.
  • This is the second time Carl turns old. The first was in Granny Baby.