> And why is it that most older people answering on these threads are so passionate about learning and about new technologies and the latest and greatest javascript frameworks. Do they really enjoy having such ephemeral knowledge and basically competing with anyone that's finished a bootcamp or not even that?

Nobody enjoys having their hard-earned knowledge become obsolete (hence the "X11/bash/sysvinit/etc were good enough for me so let's never improve them" crowd).

But the fact is computer technology does change fairly quickly. You have to keep learning to keep up.

If you're really worried there are definitely some technologies that persist for longer than others. If you really hate re-learning stuff then I'd stay far away from the web and javascript. Stick with things like Java, Go, C#, C++ & Rust. Those aren't going away any time soon. Ruby, Docker, React, etc... I give 5 years max. Then you'll have to learn something new.