Without something similar to a union or a change in laws to better incentivize pay raises, I don't see a great way out of this :/
I'd say my company is "grey-hair-friendly", but they're still hiring for way more junior roles than senior roles. I'm not sure if there are companies that explicitly don't hire junior engineers, but then you'd at least be competing against other people looking for the same salary range. Working with a recruiter might also be a good idea if they can help find companies that would be a good match
In fact any company older that 30 probably won't care. I'm not a grey hair yet, but I actively hate startups. We aren't changing the world, we're helping cat photos load 3 milliseconds faster...
There's plenty of gray beards, the UC is starving for seasoned talent, and the HMO plans are inexpensive and cover a lot -- 5 years to vest in the pension that matches nearly 100% and you can take distributions starting at age 50.
Remote work has a way of prioritizing professionalism and solid communication over in person social signaling which is likely to help be anti-ageist.
So the list you posted:
https://github.com/remoteintech/remote-jobs
Should be a good place to start
Gov generally wants stability and is very slow to move to new technologies (pros and cons).
It's not huge money, but you can clear 6 figures a year, having better than normal job security, and a good work-life balance being a sysadmin at a gov agency.
In aerospace they seem to prefer people who know where the bodies are buried, know how to bury bodies, have buried a few bodies themselves, and can instruct others on body burying.
Better maternity / paternity benefits: https://www.levels.fyi/benefits/Maternity-Leave/
Sabbatical programs often kick in after a certain number of years. A more structured program could indicate being more receptive to higher tenure / older populations: https://www.levels.fyi/benefits/Sabbatical/
I know one company that does not fit that bill, IBM. In last April they had a lay-off, I heard from friends who worked there, the only people let go in their Dept were all over 50. Do a search and you will see many articles about that.
I wish you luck