I've just recently been thinking a lot about my own children's childhood. A lot about things I could have (should have?) done differently. And about how quickly it passes.
I remember being a young adult and how much I enjoyed those years. And then I remember anticipating parenthood, and my years as a parent of young children.
Having young adult children seems to be an interesting phase of life to be moving into. It's not a bad thing, I know it will hold many wonderful things, but it's not a phase that I have eagerly anticipated as I have other phases, and it seems to involve a harder "letting go" of what was than other phases have, for me anyway.