Earlier quoted context omitted.
Age discrimination can also be salary discrimination. People with more experience rightfully require more in salary.
This is a view that actually sometimes prevents older people from managing it in market. Because of how fast technology moves, much of your experience from 10+ years ago isn't very relevant today, so if you expect a higher salary because of it you will be disappointed. It's important to be realistic and accept that if you've been working since your early 20s, you accumulate experience that might result in a higher sa…
I do believe career growth stalls out at a certain point, though. But I chalk that up to organizational culture, not something inherent to tech work itself. There aren't clearly defined career paths where one would start out making bigger and bigger technical decisions as they gained more experience. You do see that career trajectory in management tracks, as one would manage more people and bigger budgets.