What to do after 2nd application to AirServices (Australia)
I agree with Warped Factor. If this is what you really want then keep going for it. Don't let randoms on a forum put you off!
You're not too old. Older than most trainees, granted, but I know people who started a few years later than you and successfully validated.
Be prepared though. It's a tough process, and it only gets more difficult after the selection stages. People have compared the college course to a three year degree crammed into 12 months and that's no exaggeration. Unit training - even more intense.
As for the interview questions, they sound similar to the NATS questions. You've had two shots so you get the idea. Get a pad and write down as many examples where you displayed some of the key skills that the interviewer will be digging for. Commit them to memory and deliver them with enthusiasm when asked.
Best of luck