Should I choose to go and live with him?

In 11th grade, one day I met a guy and we exchanged face book IDs. After a year or so we started chatting. Chatting slowly led into intimacy & love online. After a year in Jan 2010, he came across from CA to TX and we saw each other face to face. He told me he is 29. After meeting him, my dad told me he looks around 40. When asked, he told my dad that he is in thirties. He told my dad the age difference did not matter as we love each other. I felt liberated and optimistic being in this relationship. I am thinking to marry. I’ll be penniless if I leave home. He says he holds 2 bachelors degrees. He’s a High Performance Tennis Coach, which he is. He promises to help me financially and ease admission into Med School when I marry and live with him. My parents say, he lies to get me, instead my studies will suffer and the guy is too old for me. Also, we have diff. cultural backgrounds. My parents totally oppose this relationship particularly due to wide age difference. They say he is a fraud trying to seduce and use me. After three months of meeting e/o, in March I ran away with him but returned within 2 days because mom’s love and tears forced me to come home. 1 month later I again ran away with him. My parents want me to come back and study living with them, and wait until I get medical degree. I’m currently living with the guy. I’m in a dilemma