Is SpongeBob a kid or man?

SpongeBob is a fictional character and the main protagonist of the animated television series SpongeBob SquarePants. He is a cheerful, optimistic, and friendly anthropomorphic sea sponge who lives in the fictional underwater city of Bikini Bottom. SpongeBob is an adult who works as a fry cook at the Krusty Krab, a fast-food restaurant. However, his childlike personality and behavior often lead to him being treated like a child by his friends and colleagues.