>Do you feel that in general people are weaker these days than they used to be?

I do. Not just younger people, but at all levels. There is a lot more emotional and mental weakness, coupled with a lot of physical issues to. The whole meta is set up for ill-health. 

>These days maybe because I work in education, it seems like it is every other kid. 

As a parent with allergies (not severe and much better now), I am interested in these things. I listened to a podcast on it a while ago that highlighted that the common "avoid nuts for children" advice was wrong.

https://peterattiamd.com/karinadeau/

Avoidance is not the way. And it is likely the same with mental illness too. Safe spaces and intervention can stop kids learning what they need to learn. 

>Were kids just more private about it back then? 

Maybe - but I also think that it was far less common.