Losing Grandparents

My grandmother died yesterday. It was a sad day as we watched her slip away into a peaceful rest. I was deeply saddened by this loss, but then I began to think beyond me: what about my kids? How will they experience this loss?
I was always surrounded by grandparents as a young child: four grandparents, four great-grandparents, and one great-great grandmother. Even now, I still have two remaining grandparents. It has always been great to have the love and experience of those who have lived in their prime before me.
When my kids were born, they had three grandparents, and four great-grandparents. Now they have three grandparents and two great-grandparents. Will they experience the losses the same as I, or will they even remember?
My grandparents, as you can probably guess, were all fairly young when I was born, and still able to move around and keep their senility. Even my tiny little Italian great-great grandmother, who I called Nona, was still chugging along at 100 before she died. I have so many awesome memories of all of them, many of which have molded me into who I became today.
What do my kids remember now at the ages of 4 and 2? My son certainly has retained some memories, but what will my daughter remember? And as my grandparents age and fade away, how will this affect their young lives?
I guess I can only live in the present, grateful that they do have loving grandparents to love and support them in their young lives. I'll let time do it's work and ask these questions when they're older, able to call back the memories of yesteryear.
~Marissa
Rest in peace, Grandma!