Plankton, the main antagonist of SpongeBob SquarePants, is portrayed as a middle-aged character in the series. Although his exact age is not explicitly stated, we can make an estimation based on the information provided in the show.
In the episode “The Algae’s Always Greener,” Plankton uses a time machine to switch lives with his rival, Mr. Krabs. During this switch, he briefly experiences what it’s like to be older. In this altered reality, Plankton is depicted as an elderly version of himself, suggesting that he is currently middle-aged.
Taking this into consideration, we can assume that Plankton is around the same age as Mr. Krabs, who is known to be in his early 60s. Therefore, Plankton is likely in his late 50s or early 60s.
It’s important to note that the exact ages of animated characters are often left ambiguous, as they can vary from episode to episode or even within different interpretations of the show. However, based on the information provided, it is safe to say that Plankton is approximately 59 years old.