Another way of stating that article is that most people in their 20s and 30s have only ever known low-inflation and stability. Those in their mid-40s onwards are possibly young enough to remember how what their parents dealt with in the 70s.
I remember sitting in the car with my mom outside an Amtrak train station in the late `70's asking her why she was cutting the tops off of several cereal boxes that we had just bought from the grocery store. Apparently they were for a discount on train tickets.
Some coupons are just worth it. A guy in the 90s figured out he could get millions of frequent flyer miles from a few thousand dollars of pudding.
I'm in my 30s, I remember 2008 not being a fun time, didn't feel stable watching friends and family lose their jobs and then their houses!
What about the Great Recession?
Low inflation, yes, but not stability. Many people in their 20s now watched a parent lose their job during the 2008 housing crisis. Just because they didn't see the 70s don't mean they haven't seen macroeconomic calamity affect their parents microeconomic reality.