What is considered normal wear and tear after 6 years in an apartment?

Question Details:

I have lived in the same apartment for 6 years. I am moving out and gave proper notice. I need to know what normal wear and tear is for that amount of time. I painted the walls another color (with written permission) and I know that they need to be returned to white but can I prep walls with primer only (due to the normal wear and tear); won't they have to paint the whole apartment anyway. Not all walls were changed in color so some are still original paint and definitely need repainting. They are saying it is my responsibility or they will charge me approximately $50 per wall per room if I don't.

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