While other answers and comments point out that the standard of living has risen, despite the inflation adjusted real incomes staying the same, I don't see anyone mentioning that this standard of living is nowadays usually achieved by a two person income instead of one.
I saw a comment that women in 1950ies still frequently(?) earned money, however, the fact that women participation in workforce has approximately doubled in almost every age group (from ~30% in 1950 to over ~65% in 1998) seems to indicate that for a lot of jobs a single earner household has over time become insufficient. One of the obvious reasons would be that the influx of more workers in many fields should be pushing the wages down.