> If you haven't learned how to think before becoming an adult, I fear that you won't.

I find this a really scary thought. It's not that people can't because of their age, but intuitively we know that people just won't be bothered to put in the effort. Especially when they've spent their whole life in a certain frame of mind. What's the incentive to change after so much time? For the vast majority of people there will be none, and that's scary.