I have to disagree with what you've heard -- I know far more than the other developers I work with when it comes to both old technology (which is still extremely relevant) and new (such as react etc) -- the bootcamp devs I've worked with have a barebones understanding of coding and regularly make massive mistakes that cost companies money. Fresh graduates are no better, nor are outsourced developers.

When it comes to jobs mysteriously drying up: you're talking about ageism. Thanks to covid-19 almost every offer I currently have on the table is remote, and I have 6 years of remote experience under my belt already... I predict that ageism will start to fade along with traditional office work. At the very least I can fudge my resume and make it look like I am younger with less experience if absolutely necessary.

Furthermore I have known many over 60 programmers who have no issue getting a job. Ageism might be an issue in silicone valley and might prohibit one from getting a gig at a new start up, but I believe this problem is overblown. I think that some older devs just fail to keep up with the industry, lose their passion and blame their personal failures on ageism.