from your email, I belive you have stayed illegally in USA for atleast 3 years. As per the law you are barred from entering US for 10 years. If you had to stayed illegally, at the age of 39 it would be very difficult to get student visa for undergrad or masters. You can try for visitor visa. I am not trying to discourage you but I see it is very risky and unlikey that you will get the visa. But I will definitely ask you seek expert advice and wish you a best of luck !