if you had invested from 1960-1980.....
It is really hard to compare investing between generations and that could be a topic of a Phd. thesis and not a short blog.
A couple of problems with the blog.
Even today most people cannot save much in their 20s and even early 30s.
I would suspect that the charts do not take inflation into account.
Inflation in 1980 was 13.58%. The cumulative inflation in the 1970s was 103% so you would have needed to make that much after taxes just to break even.
It was a bit later but my first mortage in 1986 was at 9.75% and I was very happy that I got a single digit mortage rate.
Investing before about 1980 was also very difficult since buying stocks would mean buying individual stocks or mutual funds would have involved using a full service brokerage usually with loads and high fees. Buying or selling stocks that were not a multiple of 100 shares was an "odd lot" which would cost a lot extra. Discount brokerages were just starting about then and index funds were in their infancy.
401ks were exceedingly rare until the late 1990's and IRA contribution limits were also very low until the early 2000's and many states did not give IRA deductions until around 1990.
Investing in taxable accounts was difficult since federal capital gains tax rates were as high as 40% and ordinary income tax rates could be as high as 70% during the 1960-1980 time period.
As bad as they look now with their high fees things like whole and universal life insurance could actually make sense back then because of the taxes and all the other options being even worse.
It is easy to discount the challenges that other generations face but it is easy to look at some other generation and think they had it easier than you.