They would still be represented by the House and Senate.
The difference being that any taxation or spending would need to be approved, additionally, by this third chamber.
So, are you saying that today that people under the age of 18 should be exempt from taxation, well, maybe 20, because there are 19 year olds who were not old enough to vote last time. How about lawful immigrants? I pay plenty of taxes, and have no right to representation.
OK, so this third congress is just sort of an oversight committee? Taxation bills still originate in the house, or senate and are only approved by this committee and has final say? I'm assuming for both tax increases and reductions. It sounds like changing anything to do with taxes would be even harder than it is today. Likely a long status quo.
As to minors paying taxes, that's a good question, but I'm not a lawyer. I would guess it is covered by the fact that a minor is not a full US citizen yet, so we are free to exploit them. This definitely the case with immigrants. They are not citizens so we can exploit the hell out of them!
![Wink ;)](http://www.pilotspin.com/Smileys/default/wink.gif)
Hopefully soon you will be a citizen!