Why's 18 Volt in junior school again?

[CM30]

Seriously, he does not look like he's about ten years old in the slightest:

So why's he still in junior school (I assume that's right, I don't know what the US or Japanese equivalent is) again? Did he get held back a few years like that bully in The Simpsons?

 

[Vampfox]

I think that he's suppose to be younger then he looks according to TV Tropes.

 

[Glowsquid]

I'm pretty sure they're deliberatly ambiguous on wheter he's a child with an overgrown body or just retarded.

 

[ShyGuyXXL]

He's probably both very large for his age and he had to repeat a couple of grades. xD

 

[TB100]

My theory regarding his looks, is that he has a genetic condition that makes him look older then he actually is. (There are actually conditions like this that actually do exist in reality.)

 

[The 3rd Wario Brother]

He probably comes from a family of huge people. With the weird things in WW i wouldn't be surprised.

 

[Metal]

So he's a little slow is that anyway to point at him, it ain't his fault masa!

 

[Just a Wario Fan]

He had ¨behavioral issues¨

 

[Koopaul]

He was in a serious accident and got brain damage that reverted him back to a childlike state.