Which requires them to explicitly ask your age outside the bounds of qualification for a job (over 18 etc). Which ends up opening them to age discrimination lawsuits.

It does not require them to ask about your age, just the year in which you took the SAT. As other commenters have pointed out, this can range from 12 to 17.

Also, they could just ask for your SAT score and any relevant info (if you took it during COVID from your car, etc.) and then you could disclose whatever context you wanted.

That tells them everything they'd need to know to discriminate. If you took the SAT 40 years ago, it doesn't really matter if it was 42 or 47.

People are biased 25 vs. 55 not 33 vs. 34.

I don't kid myself into thinking that employers can't tell roughly how old applicants are. If they're asking for SAT they could also ask for college transcripts/graduation info. That's going to reveal the approximate age of many candidates right there. Finding out what year you took the SAT will add 0 info in most cases.

While I generally agree with you that employers should absolutely not be asking for this sort of information, they're still going to be able to make a very good guess at your general age by the dates of your education and employment.

Unfortunately, there isn't really a viable way to prevent employers from finding out your age from your resume/CV.