[conductr]

People could also regain some cognitive skill back rather fastr when they worked to regain it. But the issue is, many people just lack the motivation to do so. If you golf or cycle, it's likely a passion or hobby. Most people don't view their cognitive health this way, they view it as work. It's why most people don't read much after their schooling, learning and being smart was only ever an ends to a means (diploma, job, money, etc).

[Archer6621]

I think part of the problem is also that many people simply work too hard or have too much going on in their lives to have any kind of cognitive energy left for this sort of maintenance work, even when they reason/plan that it is useful. This also seems to be encouraged somehow (by society?), to keep going like a freight train, or maybe it doesn't get discouraged enough (i.e. it doesn't get recognized as a problem).

[conductr]

My experience as a parent to an only-child has shown me there's just zero boredom or tolerance of boredom. Any pause or void needs to be filled with something. Any time my son says "I'm bored" my default response has become "awesome", "you're lucky", "I wish I had time to be bored" along with other quips like "boredom is a life skill". Of course, I see this same phenomenon in adults as well. So my rebuttal is that most people have much more free time than they think, it's just a matter of prioritization.