Here are US wages over time, adjusted by official inflation:

However --
Official inflation understates real inflation. The government is incentivized to report low official inflation because various government payments are tied to inflation. So they have methods (hedonics, for example) to facilitate understatement.
Here is inflation using the 1980's measurement method (from shadowstats.com):

If you adjust the wage chart by real inflation, you see real (inflation-adjusted) wages substantially decreasing over time. They are not flat.
We all know this (if we are old enough) because we remember what a single-earner middle-class household was like in the 1960's: single earner, stay-at-home mom, a few kids, a dog, a house, a car or two, some savings for retirement, and a decent middle-class lifestyle for the family.