Any anecdote will suffer from survivorship bias (and also negative anecdotes). The data on the other hand are very clear that people are not doing as well as their parents. Unless you have a theory as to why Americans simply became more lazy, etc. a starting point should sensibly be a systemic explanation.

Also, just speaking about your anecdote, let me add my own. I am also doing fine. Not particularly rich but middle class, good income, and savings for retirement. But I just got hit with compounding dental issues, which despite having the most expensive health insurance from my company that's well known for providing excellent employee benefits, it will end up costing me at least 20k out of pocket, potentially going up to 30-40k due to the need for multiple surgical procedures.

And fortunately we can manage it, but if the same issue had happened to me 5 years ago, I would basically be at the edge of my savings where even a minor unexpected cost would have put me in terrible shape, and 10 years ago I may have had to declare bankruptcy, or more likely, do without either suffering in pain, or pushing off the problem to be handled by even more expensive work a few years down the line, taking on expensive debt, or setting myself up for periodontal disease which leads to a whole host of issues including significantly increased risk of dementia.

Even if one is earning and saving decently, the precariousness of life in the US of A today is incredible.