No it didn't. The movie did not have the last chapter, but I don't think Alex just growing up completely changed what he was trying to say in the novel.
I think we can confidently say Anthony Burgess was not a fan of Kubrick’s film. The reason being: Kubrick, and the original American publisher who published
A Clockwork Orange, missed the entire point of the novel: redemption.
As I’ve mentioned before, Burgess’ original American publisher didn’t include the final chapter of the book, despite Burgess’ protests. Burgess admits that he needed the money and eventually caved to the publisher’s wishes. All other original editions of the book included the final chapter, but Kubrick based his film on the American version.
So what Kubrick released to the public was a depressing story of violence with a bitter, cynical ending. Essentially, the film said humans can’t change. I don’t want to spoil the ending, and I’ll expand on this in my upcoming review, but in Burgess’ version, Alex’s story ends on a positive note.
To not include that key chapter—only 11 pages—is kind of like telling the story of Jesus without including the resurrection. That’s no minor piece of information, right? Kubrick said he wasn’t aware of the final chapter until he was late into screenplay development, but he thought the final chapter was unconvincing and unrealistic.