Comment by Cthulhu_
14 hours ago
From experience (with a moody teenager), can confirm; I think this is less teaching methods and more personal development.
Younger children will conform more easily to e.g. structured education, teacher / parent authority, and basically do what they are told/asked to do. But at college / uni ages, you're dealing with young adults, some of which are only doing an education still because it's expected of them by parents/society. Or even when they want to be there, the motivation to do the work may not be there. yet.
It's difficult because their brain is still at high learning capacity, so one has to capitalize on that. But they also have other interests, like sleeping until midday and spacing out for ages.
Younger children will do what they are told more easily, but making learning a chore they do because they are told to rather than a joy will kill their love of learning and that is what causes the lack of motivation later on.