Sounds pretty reasonable to me too - and I'm guessing that you will be training in Auckland, seeing as that is where you are...
Your question about age depends on for what reason you are getting your PPL:
Are you getting it because you think it will help you get into the Air Force? If so, save your money.
If you are getting it purely for pleasure, and are not wanting to follow it up with a Commercial, then by all means it's a great age!
If you are wanting to follow on with a commerical licence, and work in aviation - do some serious research first and make sure it's what you really want!!
All the best,
KC