I can totally validate this concern.

I have a really good friend who's a Javascript pro. Like mad scientist Douglas Crockford good. He's also in his early 50's. He's been hired at some of the largest corporations and has done some absolutely amazing work.

But he never sticks around longer than 6-8 months for the very reason you cite.

Just like in his current gig with a huge financial institute where he completely rewrote all their tools in Angular and Node in four months, and then basically said he was bored and the company was moving too slow for him!

He's currently looking at starting his own app development company and doing his own thing finally, which he really needs. He just has so much talent and experience, he had a hard time finding anything challenging anymore. And since Javascript developers are in such high demand, he can come and go when he wants to - something his experience and talents allow him to do. Something someone in their 20's or 30's just can't compete with.

We both currently work in the midwest, and the tech scene here is really vibrant.

Over the past couple of decades I have become more inclined to stay in a position due to the fact that I am not feeling the need to make more money or climb the corporate ladder. I wouldn't take a job that was going to be boring but I also know that a job is often what you make of it. My experience has always been that there's always challenging work that others don't want to take up because it's not on their career path, not high profile, and etc.

>... may be bored and want to leave.

To follow your line, you could reject with the same success persons who have mentioned "Haskell" or "Compilers" (or "Game dev") in their CV, regardless of their age...

(Assuming you're interviewing for "yet another CRUD job")