That's called being old. Generally considered out of date, unable to learn new stuff :-)

Yet, always held a job, so far never part of a layoff, still pulling my weight. If you are not constantly learning then you are falling behind. The biggest differences from my younger days are more distractions in my personal life (family), and I make better decisions than I once did.

It depends, if your "master of many" list is all old technologies, or all new technologies.

How about the newest version of an old technology

I mean, all that really matters is if your list of technologies matches up with what the company currently uses and what they would aspirationally like to use in the future.