All kidding aside, there are many studies about this very thing. Additives to food and water that were not there when we were younger correlates to the rise in many ills. Now while correlation does not always equal causation, there is evidence of many of the additives causing harm over time. Then there is the packaging like you said. Add to that new chemicals used in food production, the push to (over) medicate every stinking little thing for every one, participation awards for crap performance, social media, "SJW" issues for things that don't need it, lack of ability to parent, movement away from GOD (not just religion it's self), not holding people accountable for their actions, political critters, and just plain ol dubassery, you quickly see why we are screwed if things don't change soon.It's easy to make this a political thing, but lately I have started to think micro pollution is what is making every younger generation this way. There aare a lot of hormone disrupting chemicals in plastic (such as pthalates) that you cannot avoid in normal life, and I would imagine that early exposure and then frequent re-exposure makes people imbalanced like this.
A lot of you old guys here probably grew up in a time when consumer goods were packaged more in glass, paper, and metal, which would have helped to prevent exposure.