Can I travel all states in U.S. with my 12years old car made
from Camry and 125,000 mileage on it?

Hello kkakkung2000, I think what you are asking is can you drive your
old car, that probably won't pass emission tests, in all states. It
depends on which state and county you register the car in. As far as I
know you can drive a car anywhere in the US that is legally registered
and inspected in some state/county. If you can register and have the
car inspected in some area which does not require emission testing,
then you should be able to operate it anywhere in the US as long as
you don't stay long enough that you are required to change the
registration to a new state/county. For example, where I live in Idaho
there is no inspection of any kind required. I can operate my vehicle
anywhere I choose to travel in the USA. I drive to Boise quite often
and emission testing is required there, but I don't stay long.

Cruise on, Redhoss

No one can promise that your car won't break down, but the Camry is a
workhorse, and 125,000 miles is probably nowhere near its limit.