Not sure I've made peace with it at all, but a quiet retirement and to go easy knowing my children will be ok - my younger son is severely autistic and has significant LDs and will one day be reliant on the compassion and competence of others, people he's not related to who won't love him like we do.
And while we're still alive, we will ALWAYS be the parents of what amounts to a small child. That is something I'm pretty bitter about as I watch my peers allowing their kids more freedoms and the anticipation of, ultimately, independence. We love him so much, but he is always going to be our small child really.