New Driver

So I just waved good-bye to my 17 yr. old daughter and 15 yr. old son.  What is so significant about this?  The 17 yr. old is sitting behind the wheel of our minivan and my son is the passenger!!  AND, I'm not in the car!  This is a first for me, and I feel nervous, but it all feels natural.  Like it's the right time.   I never thought I would arrive at this place (not completely freaking out because I am not in control) but here I am.  And I can't fight it.  So, 2 teenage drivers down, 2 to go.  Plus, a lot more gray hairs!