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As an older developer, I can say you are facing an increasing headwind from the industry as you age. Yes, you can bust your gonads ever more to both keep up with changes and compensate for the negative stereotypes of "oldbies" to socially fit in (or fake it well), but a headwind is a headwind. The industry simply is not friendly to the aged, relative speaking. The "geezer monkey" on your back grows ever heavier, real or perceived.

A lot of it is caused by change for the sake of change. Fads are quickly jumped into without stopping to think, creating unnecessary change. If possible, let somebody else be the guinea pig. However, developers are afraid of "buzzword rot" on their resumes, creating a self-fulfilling prophecy of change-or-die: you have to throw out old stuff to keep up, and keeping up results in throwing out old stuff because people stop using it, making support dry up.

IT is really a fashion industry, and less a technology industry. Let's face it: fashion and sex are mostly for the young. I'm just the messenger.

Some more advice: stay away from the UI industry: it changes the fastest and is most subject to fads. Try to focus on the back-end if possible.