I know that the only constant is change, but one difficult adjustment is the feeling that you're obsolete to your grandchildren. Not that they don't love you, but you're not really essential to their happiness and well-being.
Not every family works this way, but overall, it's pretty normal. Acceptance of the fact that they're growing up, and this is how it was meant to be, is a healthy way to deal with the feeling. I'll let you know how to do that, when I figure it out myself.
