As my wife and I approach our mid-fifties, the once creeping realization of a finite life is gaining speed. This provides the motivation for making every moment count, of making the right (productive?) decision, and of not "wasting" time. Subconsciously, and inadvertently, and without malice and with only the best intentions, we project this new-found life discipline on our children, from pre-teen to early twenties.
We sometimes forget what it was like to experiment with love and relationships, to be reckless, to play, to try new things, to make mistakes. We forget what it's like to live in the moment, a way of life that's already discouraged early on in our Western culture.
So for our children, as well as for others, listen to us but don't always do what we ask you to do.