>Except that even now I’m too immature and stupid to know what they are.
This is the bigger problem, not the type of car or clothes you drive. I dress like a schlub and drive a Toyota and don't feel any of the social pressures you're talking about. I think it's in your head.
>145 -> 120 IQ decline
You're also putting way way too much emphasis on this test. The methodology of IQ tests is also entirely questionable. I'd hardly be judging myself as a parent based on this.
> I think it's in your head.
It may be, but it also could be the community/town he lives in. I certainly do know schools where you need to play games to get admission, and dressing like a schlub would exclude you (which is fine, given I have alternatives - he perhaps doesn't).
> The methodology of IQ tests is also entirely questionable. I'd hardly be judging myself as a parent based on this.
Fully agree on ignoring the IQ (why would one even get it tested?)
However, I suspect he does see other signals of decline, and sees those who went to the school achieve more.