Yup, that’s a problem as we mature. There was the Lensmen series, great S-F in Astounding/Analog magazine that I read and loved as a kid. A few years ago I was browsing in a used book store and saw all five of the paperbacks. I figured I’d enjoy rereading them after about fifty years so I bought them. Geez, were they infantile. I hadn’t realized how immature I was as a teen-ager.
I think the issue is: “What is a new idea?”
An idea is new the first time a child encounters it even if it is 1000 years old. Kids are assembling their paradigms of reality and television was a new kind of input when we were kids. I think today kids are overstimulated but how can they know what is garbage information?
I remember being kind of shocked the first time I encountered the ideas of atheism and agnosticism in a sci-fi book. Wish I could remember what book it was but I know it was SF.
I still kind of like the dry cynicism of Our Miss Brooks but it is not as impressive as it once was I suppose.