Such wonderful news from dogsmother, and such a sad post from CathSoc62. Gransnet is full of the ups and downs of life.
If first became a Grandma when I was 60. My adopted DD's two are 23 and 20.
My Aussie-living DD had a donor egg daughter when she was almost 44, and my Aussie-living DS became a dad when he was 40. The GC are now 5 and 2. Amusingly, my 2 yo GS is the only blood relation to me, out of my 4 GC, but they are all dearly loved.
I'm sure that you will love being a Gran, and you're so lucky to have then living nearby. I hope that everything goes well.