Or when your constraints change as you age and develop your private life. Programming jobs are plenty until e.g. you have a spouse and a kid to provide for, making your salary demands higher and relocation more difficult.

I'm 40 and have 4 kids, so no problem here.

Maybe in other parts of the world. But at that point you need to convince them you're a "senior architect with loads of experience"

I hope it would not. I'd rather spend my time becoming better and still have ability to choose good place, then learn how to act 'right' just to keep my job.

Yeah or if, as non-technical people, bad and good are indistinguishable to them!

Rule #1: Do not work at a company that can’t appreciate how good you are.

Rule #2: Do not work at a company that can't appreciate or value how good you can become.

Rule #3: While working, make every effort to learn new things and improve yourself.