I know that for me, being a "grown up" is precarious at best. We always have to learn, and there are things that we might have been expected to learn by a "certain age" that we never did. That doesn't mean we can't, although the clock is ticking for some of us...
I'm not saying that I'm not for my kids in the long haul, or grandkids, but two things I know: that I was very independent and when I got married I was done being parented and my wife and I moved away from our parents to live our own lives. I don't necessarily expect my kids to do the same (and at this rate, only one looks like she's got the drive to do that), but perhaps that's a hidden expectation I have? The second thing is that I know my own limitations and I don't know how much I'll have to give to my kids. They will grow up smarter than me in many ways and if they have an independence streak like me, then I'll let them go freely, and I will be confident that they'll be okay.