imported post
Even if you are 21 and have a CCW permit you may not be able to conceal carry in some states, three that come to mind are Illinois, Wisconsin, and Missouri. Illinois and Wisconsin are concealed carry "right denied states" and Missouri requires that you be 21. Also open carry in Wisconsin is a questionable idea, one fellow recently was arrested near Milwaukee for open carrying in his own yard. Now I consider Milwaukee an extremely anti-gun city along with Madison, you might get by with it in some central or northern areas of Wisconsin. I say that as someone who lived there for 31 years and never noticed an ordinary resident open carry.
Always check the laws on firearms carry for the state you intend to visit.
Missouri though requiring you be 23 to conceal carry does recognize all other LTC permits.Indiana is better, you can conceal or open carry at 18 with a LTC and all states LTC are recognized.
Illinois is listed here on opencarry.org as a rural open carry state, but you can't open carry in a vehicle. I live in this "right denied state" and would say it might get you arrested, though I do it when walking my dog in my neighborhood or on my own land. Carrying open or concealed on your own property is allowed of course.
We are getting closer to getting concealed carry legislation, probably still a few years off, but if you value your open carry rights, you probably don't want to move to Illinois from Arizona.