My dad was born in 1947. He died a year ago. Lived in my basement for 3 years toward the end, we converted it to a "in-law" suite. Probably spent most of his money on medical bills though because he had an accident that paralyzed half his body.

Anyhow he worked the same job his entire life only worked his way up to middle management at a factory. Prided himself in slacking off his entire career and still did better than I do now and I have to work much harder and have my spouse be employed to pull in what he did alone half-assing it.

So it was different for sure, middle-class was easily achieved if you were a white male. I'd almost say if you were poor you just got very unlucky, were a single mom, or a minority. If you were a white male, you'd really have to be dealt a bad hand in life to not be middle-class.