Another article:

A generation ago, American men in their thirties had median annual incomes of about $40,000 compared with men of the same age who now make about $35,000 a year, adjusted for inflation. That’s a 12.5 percent drop between 1974 and 2004, according to the report from the Pew Charitable Trusts’ Economic Mobility Project.

To be sure, household incomes rose during the same period, but only because there are more full-time working women, the report said.

....The report also found that many countries, including Denmark, Norway, Finland and Canada, offer far more economic mobility than in the United States when measuring by the income differences between generations.

....Of course, the men who run American companies don’t have too much to complain about. CEO pay increased to 262 times the average worker’s pay in 2005 from 35 times in 1978, according to the report’s analysis of Congressional Budget Office statistics.

....U.S. inflation-adjusted household incomes rose only 9 percent from 1974 to 2004 — a severe slowdown when compared with the 32 percent increase from 1964 to 1994.

Going back to 1820, per capita gross domestic product in the United States has grown an average of 52 percent for each 30-year generation, according to the report. But since 1973, median family income has grown only 0.6 percent per year, a rate that produces just a 17 percent increase over a generation.
Link: Generational income gains slow - Stocks & Economy - MSNBC.com