How old is Dewey supposed to be?

The first time we see him he’s 6 years old and in the first grade, but in the series’ last season he’s 12 and in middle school.

Does Dewey go deaf?

This is the second episode Dewey goes deaf, he’s first gone deaf after Malcolm blew up the bouncy castle scaring everyone in Malcolm’s Girlfriend.

What is Dewey’s IQ?

Within the first season of Malcolm in the middle, fans learned that this character is a genius with an IQ of 165 and a photographic memory. He’s able to do math problems with memorized credit cards.

How old is Dewey from Malcolm in the Middle now?

Now all grown up, the actor behind Dewey, Erik Per Sullivan, still definitely has that baby face that made him famous. But don’t let that baby face fool you — the actor is now 28, and retired from acting in 2010. He last appeared in Twelve opposite 50 Cent, Chace Crawford and Emma Roberts.