No globalization, no robots or technology taking jobs. High paying manufacturing jobs with little to no education to enter. (think GM 20 years ago) Police officers got in at 18 with only high school diploma. Etc..
Bought detach houses for cheap, made so much money. Raised a family of 2-3 kids, 2 cars, vacations, etc, all while mom stayed at home. (real middle class)
Unlikely to have same standard today.