I have pretty much the same philosophy as ThisMomQuilts...I just want them to be happy, well grounded, responsible adults with something to offer society.
That being said, you worry about them just as much when they are grown as you did when they were little. At least when they're small you can keep track of them!
My youngest has been the hardest....that boy marches to the beat of a different drum....he's 18 this year and decided to "be independent" and moved out early January. Do I miss him...YES....will I ever stop worrying about him or his brothers...NEVER. So you are not alone...