Sentence examples for not for from inspiring English sources

The phrase "not for" is grammatically correct and can be used in written English
It is typically used to indicate that something is not appropriate or intended for a certain purpose or audience. Here are two examples: 1. "This movie is not for children under the age of 13. It contains violence and mature themes." 2. "I'm sorry, that joke was not intended for you. It was an inside joke between me and my friend."