How old is Ed ?

That's a good question, its often hard to know how old a character is supposed to be when it's a "persona" created by an actor. The character isn't necessarily the same age as the actor, you know? I don't know off the top of my head how old Short was when he created Ed Grimley, but I always thought of him as being around Miss Malone's age (we can only hope they're the same age, anyways!). Miss Malone celebrated her 25th birthday in the episode "Crate Expectations," so I put Ed at being somewhere around there.

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he's referenced as a manchild.