What should I do about my wife, whom I discovered is older than me and uneducated, and that she lied to me about her age and the duration of her divorce, given the problems between me and her family, her knowledge that I am required to pay a large deferred dowry, and her neglect of my conjugal rights?

The statements mentioned in the question are a forbidden lie and deception. However, they do not affect the husband's enjoyment of his wife nor do they invalidate the marriage contract. Therefore, you do not have the option of annulling the marriage. Rather, you either divorce her and pay the full mahr, or you remain with her. The latter is preferable to preserve the children and protect them from the negative effects of divorce. We advise you to teach her matters of her religion, and do not forget the words of the Prophet, peace and blessings be upon him: "A believing man should not hate a believing woman. If he dislikes one of her characteristics, he will be pleased with another."