Working for the PeaceCorps?

That sounds like a really cool plan.  It's refreshing to see that an American isn't following that paved American path that so many follow.  I don't think that age matters and I think it's really cool that you want to do Peace Corps.  I actually was accepted to do Peace Corps and didn't end up doing it.  I just wasn't sure that it was what I wanted at the time, and I had some issues with getting vegetarian food and specific personal things.  But, I would highly recommend going through the process and doing it.  I know that it is fairly competitive, but they also have a lot of places to send people, and the fact that you know some languages will really help.  I would recommend that you sit down and make your resume longer.  Think of experiences you've had, leadership experiences, difficult experiences and how you got through the experiences, ways in which you've helped others in your life, things that inspire you, life goals... etc.  They will ask you a LOT of questions and it's best to have done a bit if searching within yourself before the interviews, so that you are ready to talk a lot about your self.  It's sort of annoying to talk so much about yourself, but they want to hear it.... so go for it!  The more personal experiences you can give them, the better.  Good luck!  Tell me how it goes.