The problem is, when everybody thinks like this, it stays like this. With rising age People tend to change into people jobs if they can because somehow the air

The problem is, when everybody thinks like this, it stays like this. With rising age People tend to change into people jobs if they can because somehow the air gets thinner as there are not that many advanced software jobs - although there certainly are a lot and even more places that do appreciate advanced abilities. On the other hand a lot of skills/experiences are transferable. E.g. some weird DB connection keep alive bug might be analogue to debug on C++, node.js and Rust. Developers with not enough experience might give up, change DBMS, refactor the whole DB layer (hoping it's MVC'ish) or even give up on the project if it's not an important one. Also most new tech builds on the learnings of the old tech and discards outdated patterns that were possible with the existing stacks, but advanced users might have stopped using those anyways. For example Java has no multiple (class) inheritance in contrast to the much older C++.