Good observation. Those could very well be the only considerations for some people.
Maybe a good part of this is the risks and responsibilities without a co-operative village to grow families interactively.
What if the lingering problem is one of scale, that has not yet been solved?
Remember this whole thing is from a 90-year old and the smaller the village, the fewer the population of any one age group.
It's really making people think about all kinds of things all over the ball park.
If it's a small enough village you can't end up with a crowd of 1st graders ever, for instance, so age segregation as we know it for any years at a time has no similarity, and across-the-board people of all ages are part of the same group more so. Which means for one thing, if there is a 90-year old among the village, almost every one would be familiar with interacting with them routinely, as they were all growing up no less. An overwhelmingly more abundant number of adults would effectively be taking care of the children from start to finish, compared to how widespread adult influence is not intentionally minimized today, but ends up that way with same-age peers being more influential and naturally less mature.
Counter-intuitively it may even be that humanity, in the body of each family itself, thrives better when there remains satisfying group support for community focus more so than separate individual cocoons, which today are each more like on their own in rapidly changing times.
The villages humans mainly evolved to thrive in are about the opposite of what we have now in the big city.
It's also a good reminder that those of us who are a lot closer to 90 than we are 20 have still got a lot to learn.
So no quitting or you'll never be as wise as this letter shows.