I've Instructed in both GA and RAAus as well as observed a lot of people wanting to fly and many who did fly as a Career (which I did in RPT). Later, With RAAus I came across a lot oof OLDER types some of whom should not have taken it up and came to grief, unfortunately.
Firstly It is Harder for older people to be taught new things. No one knows how they will go when they actually have to fly these things. Not everyone Makes it. Second , Airline Pilots are retired at 60 and many fall by the wayside as well often failing new conversions recurrent checks or just walking away...
You are only an ab-initio once and you should do that as well as can be done with as few distractions as Possible and do the Recovery from unusual attitudes thing early in you flying experience.. It's no use building a Plane Before you are SURE you want to/can fly. Enthusiasm is what you do have. You need an experienced and Patient Instructor who you Trust and who won't just give you an easy ride. The More you see other flying people and experience various Planes the more likely you will end up with a Plane that suites YOU. IF you Train GA (VH reg) you will have better Aircraft hiring prospects and the Conversion to RAAus from VH is relatively easy. There's a Lot of Air Law you will need to know and start Learning about Meteorology and basic Aircraft knowledge ASAP. Keep your theory ahead of your flying and do thorough briefings before and debriefings after. Talking in the air should be Minimal. Don't learn from Forums or U tube. Stick to your training references and your Instructor. IF you train out of a place Like Canberra your radio work will have to be spot on and you will be held up a bit. Good luck. Nev