How old do you have to be to travel without a parent?

Im 13. I want to travel from boston, to newyork on a travel bus. It will take four hours. Also its only 15 dollars. Do I need a passport? Do I need parents with me? Do I need parents permission?How old do you have to be to travel without a parent?No you don't need a parent or permission, and a passport is only for leaving the country.How old do you have to be to travel without a parent?Well I went on an airplane without my parents and I went only with a friend when I was 7. Of course u need ur parents permission to go anywhere if u r under 18. If u r responsible I guess u could go by yourself. And no u don't need a passport.