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In  Driven to Tears  he seems sad that SpongeBob does not have his license, saying how even Patrick has a license. In the episode  BlackJack  it was found that his name is Harold. In the episode: New Digs, Mother and Father SquarePants visit SpongeBob at the Krusty Krab. He settles in Mr. Krab's office and waits for his wife to get out of the shower. When Mr. Krabs opens up the curtain and Mother SquarePants is there, he beats up Mr. Krabs. In the episode: Culture Shock, they visit the Krusty Krab to see Squidward's Talent Show. In the episode: Mermaid Man and Barnacle Boy IV, we see Mother SquarePants but not him. Mr. SquarePants is voiced by Tom Kenny and for some reason is shaped like a normal sea sponge, unlike SpongeBob.
Well, SpongeBob has a date of birth: July 14, 1986. If we assume that the series takes place in our times, that would make him 28. However, Bart and Lisa Simpson have been 8 and 10 for more than 20 years now. So if we assume that his age is constant in the show (which premiered in July 17, 1999), that would make him 13.