A major problem in our society is that '72-year-old' is in the headline. If you are not growing, you are declining or dead. Not only does the world change under your feet, you need that stimulation just to stay healthy. We ruin the talent, economic value, and freedom and opportunity of a very large portion of the population by dimissing the growth of anyone in late middle-age or later. 72 years old shouldn't be remar…
The reality is that most people's mental abilities have started to decline by this age, particularly the capacity to learn new things. That makes this story all the more remarkable. Part of that I think is certainly as you suggest, that the brain is a muscle, you need to use it to keep it fit. But you can't escape nature either. To keep the muscle analogy, you won’t compete as an athlete at 72 no matter how fit you r…
My claim, which admittedly is hard to substantiate, is that growth (a general term) will offset aging to a much greater degree than people imagine. In fact, I wouldn't be surprised if psychological and physiological aging of the brain is mostly due to lack of growth.
> To keep the muscle analogy, you won’t compete as an athlete at 72 no matter how fit you remain.
I think the muscle analogy can be a useful one, but that it misleads here: Muscles start deteriorating at age 20 or 25; our brains do not on balance (they do in some ways, and improve in others). Peak mental performance is, IIRC, in our 40s and 50s.