I’m in my 50s and I’m not even thinking about those things.
I'd challenge you to enter a school. I volunteer and run two clubs and they very much are talking about these things.
In comparison to other generations? Yeah, they are.
I was very worried about climate change as a kid, and still am.
I was worried when I was a kid, now I'm much less worried. Plenty of other things to worry about, and there's still a non-zero risk, but I think there's enough money to be made fixing that particular issue that we'll probably be OK.