Does it seem like most of the families around you are waiting longer to start having children? I don't mean that to sound like a universally bad thing, sometimes it makes sense. But many of the people my age (35) that I work with and live around are just now thinking about having children, and I wonder what the consequences are if this is a large trend.
Growing up I didn't know my grandparents hardly at all. This was probably due to the age of my parents when I was born and some past family conflict. My frequent moves across the country have only increased the emotional distance with my extended family. I really don't know what I'm missing, but I think it's probably significant.
I wasn't smart enough to know beforehand that having children in my twenties would allow our parents and our children more years to know and enjoy each other, but thankfully it's working out that way pretty well despite the distance. If we were just now having our first child, like so many around us, I think our parents would be too old to enjoy them in the same way they have over the last decade.
While the age you become a parent might not matter, biologically, as much as it used to, it seems that age still matters very much for grandparenting. Family planning affects more than just parent and child, it strengthens or weakens at least three generations of your family.
"May you see your children's children!" Psalm 128:6