I've often thought the same thing. It has me thinking cautiously about the sociological implication rapidly expending 'senior' demographic, growing life expectancy, and the rapid pace of world changing technologies. Is there a point where senior citizens can't keep up cognitively, despite the medical advances that may keep their bodies younger? And further, is there a point where their dominance as a percentage of society means we need to slow our adoption rate of consumer technologies to account for neurological barrier?

I also think about the people who want their brains crygenetically frozen after they die. Assuming they die old, with this cognitive scaffolding adapted to life today, I can only imagine the impact of 'waking up' into a world 100-300 years in the future, with such a drastically different world. That sounds psychologically crippling to me.

And finally, are there techniques I can take advantage of now, when I'm [comparatively] young, to keep my brain receptitve to new ideas, mental models, and raw sensory input? Meditation? Arts? Travel? Literature? All of the above, and if so, where do I find time for it all, while advancing my career?