Right now I'm not sure there is a country where young people are generally satisfied and optimistic about their future. America is a mess, Europe is generally a mess, China is struggling with too many grads who aren't able to find jobs matching their qualifications... From what I've heard things aren't exactly great in India either.
Every country has its problems.
Australians will complain a lot but honestly the future is very bright. Higher exports than imports, government debt isn’t completely out of line and it’s not going exponential like some regions, it has European like public services, a median wealth 2.5x that of the USA, good employment figures.
It’s not perfect but i still think it’s pretty good.