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have you ever thought about how come maggie never grows.

Nope they have bdays all cartoons are like that

This was the best rationale that I could have come up with when I came about the same though regarding their age. But to think, 300+ episodes doesn't exactly mean a years worth of events since within many episodes they display events that occur over more than one day. For example, Bart traveling to France or Homer seeing his mother for the first time in years.

It's just a running thing that I think works well with the simpsons just being the simpsons. However there were points when Bart and Lisa were in a grade lower than they have been shown to be ya kno'. =P

ya i know

Seems to happen in a lot of shows. rofl

I remember one, where Lisa and Bart saw their future (about 10 years) and Maggie didn't grow at all.

I've always thought that all the episodes were in a one year period.

She's got an anti-growth disease. Actually, the whole town has it.

Lol. It's a cartoon.