Do you have any evidence for this assertion, or are you relying on intuition here? A cursory search yields a number of references similar to this one---https://reno.nyloffices.com/resources/articles/starting-a-fa..., which indicate that the cost of raising a child has gone up significantly, at least in the last 40 years. And many of these references do not include the cost of college, which has skyrocketed. I'm not sure what you mean by "bringing up kids the way they were brought up in the 50s and 60s." They certainly had housing in the 50s and 60s, and that single expense alone is probably enough to make today's kids more expensive.