Front rotors

Well,

I was getting a grinding noise from the front right wheel and found out that I am down to the metal on the outside pad.

The inside pad was about 50% and both pads on the left wheel were about 50% too. I replaced the pad about 2 years ago.

Anyway, I'm wondering if this is signs of a warped rotor? The outside pad is the only one showing excessive wear.

Two more questions:

1. Can a warped rotor be turned to be true again?

2. If not, If I replace the warped rotor with a new one, will the thickness be an issue against the old one?

TIA for your help.