I agree with this comment and there's a lot of truth to this observation, except for one tiny nitpick: "buddy, you're out of market."
That depends on many factors, though...primarily the employer and what kind of work is done. For instance, Google has a huge C++ codebase that needs to be maintained. I guess it could be argued that even in C++, one needs to keep up with the C++11/C++14 curve, but I doubt that curve is as extreme or difficult to keep current on as, say, new developments in JavaScript.
> it could be argued that even in C++, one needs to keep up with the C++11/C++14 curve
It would be a poor argument. An accomplished senior level candidate may not not follow all the proceeding of some language committee, but could have all kinds of important technical and non-technical skills. It's often more valuable that your engineers understand your problem domain well, produce code with a low defect rate in a steady rhythm, encourage others to excel through management or mentoring, etc.
C++ is drastically different today from 10-15 years ago. Sure, so is Javascript, but C++ as a language and as an ecosystem encompasses vastly more concepts and operations than Javascript, and the language itself seems to add complexity at a much greater rate.
There are new features in both, sure, but "drastically different" seems to imply that someone proficient in the C++ or Javascript of 10-15 years ago would take more than 2 weeks to get up to speed. I think that's unlikely.
"Oh, the compiler does that automatically now!" is not such a steep learning curve.
I know old-school C++ with templates. I think it would take me more than two weeks to get up to my current level of Ruby proficiency due to all the changes in the STL, Boost, auto pointers, lambdas, etc.
That depends on many factors, though...primarily the employer and what kind of work is done. For instance, Google has a huge C++ codebase that needs to be maintained. I guess it could be argued that even in C++, one needs to keep up with the C++11/C++14 curve, but I doubt that curve is as extreme or difficult to keep current on as, say, new developments in JavaScript.