Can an 18 and a 17 year old fly out of country?

Can you speak the languages of the countries you plan on visiting? Do you know what is called for for legal entry into these countries? Do you know the Euro to dollar rate? Do you have a plan? What about over-seas call on your cell phone- different rates. Parental permission IS required when applying for you pport if under age. Otherwise, have fun, but be careful. Europe is nice, but france sucks