Australia can be a very expensive place to live. Remember a lot of stuff has to be imported and they aren't exactly on the doorstep of Europe as we are so it all has to come by boat. New Zealand has the same issue. Both are Islands whose economies are drastically different from Europe or North America.
Wages in Australia can in some cases be half that of what you'd get in London for roughly the same position. That being said, Australia DOES have a very different business and lifestyle mindset compared to the European rat-run I feel. They are in the main a lot less stressed (better weather for starters probably helps) and they take their health a lot more seriously, too. Australia is big on mining stuff out of the ground. People with practical skills and trade experience can make a lot of money in no time at all there, New Zealand is similar in some respects (less mining though). If nothing else, I'd recommend young people try a year exploring and working down there, Australia, New Zealand or both. The population density is an entire world away from Europe. From memory New Zealand is about 90% of the UK's land mass but with 1 tenth the population. Communities are built different and people are just subject to the vagaries of the property treadmill in both places. Sure, some of the desirable places are London/New York money but go out of town a bit (relatively cheap fuel, too) and it's different.
I have family in both, plus my brother lived out there for a time as a young man in the gap between education and real-life. Had a blast there. I think in truth provided you aren't going there with a 'British' mindset, they actually like the Brits. Anyone with two hands and the ability to graft and aptitude to learn (my brother had very little in the way of what I would term traditional practical skills but ended up working in road building/earth-moving and construction big time) will find work and a good income no problem whatsoever.
In the Southern hemisphere, just stay out of the sun or cover up. It will nuke your skin in the same way a sunbed will.