That data series is misleading because of what you're seeing. Ostensibly you'd think that means wages are going up, right? It doesn't. Here [1] is the data set for that - weekly real earnings. They're barely moving - up about 13% over 50 years. And given now a days we have a lot of new and practically mandatory costs to deal with, such as internet and computing/telephony devices, real wages are probably down in practical terms.
So what gives with your data set? The data set I give covers wages for full time workers. The data set you gave covers all individuals 15+ with any "income", which includes governments benefits. So what you're likely seeing there is going to be, in part, driven by things like an aging population - with a large number of retirees retiring with social security, medicaid, pensions, etc fattening out the middle part of society where income, after all is accounted for, of around $40k sounds just about right. It's mostly unrelated to the change in wages.
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Also, unrelated but I found your examples of 'better life' weird. I still hand wish dishes and line-dry clothes. I know Jeff Bezos and Bill Gates also hand wash their dishes. The "nostalgia" people have is for things like somebody graduating debt free, with a decent car, and ready to put a down payment on the first home - on the back of a part time job that put them through school. That really did happen, but now a days it sounds like a fantasy. I think society would happily trade dish washers for that!
[1] - https://fred.stlouisfed.org/series/LES1252881600Q