My son is in high school he is 17 in the 10 grade and I live in CT and have an order to pay child support when do I stop making payments?

In Connecticut, the law is that child support ends on the later of the child achieving the age of 18 years or if still a full time high school student upon graduation. However, in no event will child support continue beyond the child's 19th birthday. You should be aware that there may be an obligation to provide an amount of funds for college tuition. Look at your final decree to see if there is that obligation. Sometimes the court retains jurisdiction over that part.