Cultural Victory??

I am playing on noble with the Aztecs and I have three cites with over 50,000 cultural points and for some reason the game isn't ending. I need to end quick because the Chinese are attacking with marines and artillery and I only have riflemen and catapults.

What game speed are you playing on? The limit is 50k on normal, but higher on epic and marathon. A city is labelled as having "Legendary" culture when it has reached the required limit, so have all three got this?

alright, i see, i am playing on epic so i need 75000