In 1995 the real median US household income was $52,664. In 2015 it was $56,516 [1].
US Hourly Wages for nonsupervisory workers has certainly grown over the last 20 years, but not in the past 40 years [2].
[1] https://fred.stlouisfed.org/series/MEHOINUSA672N
[2] https://en.wikipedia.org/wiki/Household_income_in_the_United...