Stupid Ages

In the 30th century the term Stupid Ages refers to a very generalized and ill-defined time period that takes place sometime in the 20th-21st century(s).

Time Period
The exact time period of the Stupid Ages is unknown but judging by its usage, it is the time period in which Phillip J. Fry lived. In the episode an exhibit at a museum had many ancient relics including Fry's dog. The exhibit also suggests that it took place in the 20th century however it could also include the 21st century as Panucci's Pizza lasted up to at least 2012.

Appearances
Appearances of the term, not the ages themselves.
 * (mentioned by Leela)
 * (an exhibit at the museum is called "Treasures of the Stupid Ages")