Since SpongeBob SquarePants' 1999 release, its titular sea sponge with surprising comic origins has wiggled into fans' hearts with his energy and unwavering optimism. Through movies, spin-offs and over a dozen TV seasons, audiences have learned a lot about SpongeBob over the years. Still, there are several SpongeBob SquarePants mysteries -- including how old Spongebob is.
Source:https://www.cbr.com/spongebob-squarepants-age/