The irony is that a lot of things you list are causing huge challenges for the environment and are not sustainable, so maybe a golden age for your generation not so much after.
True enough, but there has been progress on many fronts. I grew up in the era of leaded gasoline, and surely carry around a lot more lead than young people today, leaving me at elevated risk for diseases. Our waterways used to be far, far more polluted. Air pollution has been drastically reduced.
The birth rate going down will help a lot in making things more sustainable long term.
The birth rate going down will help a lot in making things more sustainable long term.