Should Your Grandma be Driving?

I was driving along the other day, on the way to the hospital to meet my grandson for the first time, my daughter-in-law was in labor. As I passed by my wifes grandmothers place I saw an older model Ford Taurus heading the opposite way on the highway. As it got closer I saw that it was her grandma driving. She didn't really seem to be looking at the road but was driving fine. She had a big smile on her face but paid no attention to me as our cars passed. What makes this worth writing about? She died about three years ago. I think I saw a ghost, and what a neat day to see a ghost. On the day that her great-great grandchild was born!
I would think that it was just another old lady except for three things. It looked exactly like her, the far off look - not looking at the road at all yet driving fine and the topper, it was right in front of the house where she had lived for the last sixty years.