You’d have to look at the size of the middle class back then, as that’s what the “American Dream” scenario is based on there, but as a kid born in 1990, I can say that when my dad was looking for apartments when he was around college age in the 60s, the rule was not to rent an apartment that cost more than 25% of your salary. By the time I was around that same age in the late 2000s/early 2010s, it was 50% of your salary. Now, it’s closer to 120% of your salary for those same apartments.