This may sound like an old lady bitching about how things aren't as they used to be. When I was young that's how I took this sort of thing. But with age I've found out what they meant. Changes go on over a lifetime, some big, some small, some individual, some collective. Unless you choose complete ignorance you can't help but notice them.
Something I've noticed is the pandemic of allergies. Everyone has allergies now, even pets. In my parents' generation, the only allergy I remember any of them having was to Pennicillin. I inherited that one. But I seem to have developed a few that originate in my generation. Mold, dust, some foods, some cleaning products, some fragrances, several drugs. We live in a different world to the one my parents and grandparents came up in.
For one thing, we are the Guinea Pig generation. We got vaccines, food additives, fake foods, drugs, pollution, asbestos, lead, mercury, refined mixed cleaning solvents all over our homes and clothes- the full chemical age from the time we were young. Prior generations had some of these things but not to such a degree and not for their whole lives.
My grandmother Nana called doctors, "Pill pushers." That's truer these days than ever. In the last decade I've never left my doc's office without a prescription in hand. Everyone I know who goes to a doctor has at least one script, if not several. What the hell? It used to be that only shrinks prescribed psych meds, not anymore. It took a big deal to get a script for anything until the late 80s. Then they became Monopoly money. Now even children are on several meds at once from an early age. Who knows what that will do to them, and their descendants.
These are just things I've noticed. Correlation doesn't prove causation, but is grounds for investigation. Somebody ought to be studying this. Of course it probably won't happen because it could screw with profits. And in this world, it's profits before people, unto the seventh generation.