I’ve finally figured it out. The reason we’re here is to be children. When we’ve stopped being children, then the meaningful part of our life is over, and we serve out our days facilitating the childhoods of other people. That just means providing them with the resources, the safety and the guidance that allow them to Play, Learn for the sake of learning, and Rejoice in the world. To the extent that we stop doing these things ourselves, we stop being children and the important part of our life is over. We then move on to the part where our only purpose is to serve those who are living theirs.
Of course the real question is whether we can do both.