This [1] is the real median personal income. The data there only starts at 1974 but you once again see a 32% increase in income. Now factor in the change in hours worked. The average American works more than 100 less hours then back then. [2]. These numbers combined along with arguing that most people only saw a real increase in wages of 12% is simply not possible, nor is it possible to simply attribute all growth to the rich.
Now there is this [3]. The numbers from that paper are really what made me start digging into all of this stuff. To give the long and short of it - the poor are becoming middle class, and the middle class are becoming rich. With the net effect being a major decline in the number of poor, a major increase in the number of rich, and a small decline in the number of middle class. Probably not coincidentally, not entirely dissimilar to the hypothetical I proposed where the median can end up being misleading. These 'nobody except the rich are seeing more money' articles seem to be simply untrue, but they are click magnets.
[1] - https://fred.stlouisfed.org/series/MEPAINUSA672N
Maybe I'm an outlier as an individual in my mid-20s, but it's enough to make me question the definition of class on annual income.
[1] - https://abcnews.go.com/Business/study-28-percent-millionaire...