I will be 68 years old in 2050, and should be 10 years into retirement. That's all I know.
Don't bet on that at all.
Anyway, I expect the global standard of living to rise as more nations are brought into the global network. At the same time, expect civil rights to be eroded, upward mobility to stagnate, inequality to increase in the first world, and cooperation between governments and corporations to increase. In short, the basic needs of most will be met, but the world will be a more enslaved place.