I don't think you even know what you are talking about any more.

I am talking about this statement:

There's virtually no programmers after the age of 50s and that's due to a combination of involuntary unemployment, inability to process newer/hotter tech, and burnout. .

The articles you cited are about discrimination, and none of them demonstrably link the phenomenon to the causes you cited. If you bothered to read some the articles you linked, you'd see that it those reasons are not at all related. Some of the anecdotal evidence you presented:

• Younger workers are more likely to work for less.

For tech startups, it usually boils down to cost: most can’t even afford to pay $60K salaries, so they look for motivated, young software developers who will accept minimum wage in return for equity ownership and the opportunity to build their careers.(Source)

• Programmers move on to more senior, non-programming roles, of which there are fewer positions:

David acknowledged that the vast majority of new Microsoft employees are young, but said that this is so because older workers tend to go into more senior jobs and there are fewer of those positions to begin with. (Source)