How old is Toby?

Well in the broadway show he's a retarded adult, in the movie he's a kid. I don't know the exact ages, but that's the difference. I like him as a kid, actually. The first time I saw this version I actually thought it was supposed to be a kid, and it was just played by an adult for convenience. But a retarded adult works too.

In the stage version he is NOT meant to be a retarded boy/man .

If you may or may not notice , when Lovett and toby sing " not while im around" , she says " oh what a sweet CHILD it is".

also with the story/genre and goryness of the play and the year and time it was done , a child wouldnt have been allowed to play the part. even now , a child is not legally allowed on a stage much after 9 o'clock at night.

so really it is a boy (what the part is meant to be), they couldnt have had a child play the part.
i think Jennings plays the part very well , as they all do.

I don't think that it is really known as to how old Toby is supposed to be, Ed Sanders that played Toby for the film version was born in 1993, that is listed on his page here. Kenneth Jennings that played Toby in this version his birthday date, or year is not mentioned on his page. In the film version yes he does look more like of a child, but still that part is not to be known, he is not asked how old he is, and not to sure if he know how old he is. But in either production, Sweeney Todd tells Toby to tell Mrs. Lovett to give him a big tub of gin. And at the time the story is taking place, I don't know if London has rules of how old somebody has to be to drink drinks like gin. So all I can really say is that your guess is as good as mine.

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He's supposed to be 10 years old. But they cast an older guy to play him.

I love you, Kristen Stewart. :) You are so beautiful and talented. I would love to perform with you.