A friend has a five year old who has set himself to the task of creating a book about Batman. An adult can look at that kid and see both that he is learning how to undertake projects and bring them to completion, and that the skills he develops now will be of value to him much later in life.
The kid himself, however, does not see things in the same light as the adult, and does not recognize the full significance of what he is accomplishing.
In the same way, and for the same reasons, a teen or young adult will do things only a much older adult can recognize the full significance of. And sometimes about all the older adult can say that the younger person is more or less sure to understand is, “Good job!”