His age has never been stated but it's apparently a running joke that he is older than the rest of the children since he has a son and was in the 3rd grade with Otto.
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Old Money
Sydney Kearney was born in 1870.
Hans Moleman is actually 31 years old but looks elderly.
The Simpsons creator Matt Groening is 63 years old (birthdate: February 15, 1954).
In the entire world... of course not. I'm sure there are millions of people don't care for The Simpsons.