Is Oliver Twist appropriate to be read to a 7 year old child?

Do you mean for casting or for viewing?

For casting, Fagin's boys can be all ages of young men. A general age range would be from about 9-15 years old (or any young boy having the look of a 9-15-year-old).

For viewing, it should really be a parent's decision. There is a little bit of rough language (I mean, slightly offensive, but nobody drops the F-Bomb or anything), and some of the themes contained within may be more than a young child can handle (some scenes deal with issues ranging from prostitution, to murder, to homelessness, to theft). It depends on what you, as a parent, think your child is prepared to be exposed to. Despite some of the dirty, real-life issues in the play, the story is about love and family, and finding a real home, and is really beautiful.