My story covers both ends of this. Mom had me at 21 (dad was 30). I knew both my grandmothers and neither of my grandfathers. One was left behind when my mom

My story covers both ends of this. Mom had me at 21 (dad was 30). I knew both my grandmothers and neither of my grandfathers. One was left behind when my mom's family immigrated. The other died not too long after my dad's family immigrated - just before my dad was born I had my son (now 4) when I was 41. Both his grandmothers are around, and neither of his grandfathers. My dad died last year and my son barely remembers him. My wife's dad died when she was two. I'm glad to say my son and my mother are very close - they spend every other weekend together. His other grandmother and my wife aren't close and so my son doesn't know her very well. Not sure if there's much here - except to say that having kids in our thirties should still be young enough that healthy grandparents can be around for the formative years. And regardless of age, life happens, and a multi-generational family unit isn't guaranteed.