Sucks there isn’t a poll. I was 26.
My maternal grandfather is still alive and doing well at 87. I am 41 and it is very likely that he will be around for my 50th birthday and my 55th isn’t out of the question either. He still has two much older living sisters both in their mid-90’s and doing well in general especially on mental acuity. My grandfather still drives, goes to casinos way too often, travels and runs his own real estate brokerage. His grandfather was one of the very last Civil War surviving soldiers who died in 1949 at 100 years old despite heavy drinking and smoking until the end. That branch of the family is very difficult to kill. Most of them make it to their mid-90’s - 100+ with no special effort.
I lost my first grandparent, my paternal grandfather, when I was 7 and he was 55. He was a WWII POW and never fully recovered from his injuries. His heart just stopped during some routine medical tests.
I lost my maternal grandmother when I was 28. No great loss there but it was unexpected. Despite doing everything she could to jeopardize her own health over the years, she simply died suddenly due to complications from hip replacement surgery.
My maternal grandmother died just a few years ago at 85 and I took that one really hard because we were especially close. She somehow had advanced cancer that wasn’t discovered until a month before she died. It moved quickly to wipe out her mind and her two children made the decision to not tell her that she even had cancer and would die soon. I don’t know if I would have done the same thing but she always thought she would get better from this ‘mystery bug’ until she went into a coma and died a few days later.
32
In one of those quirks of ages, when I was born, I had two living grandparents (the other one dying when I was 8), but three living great-grandparents, the last of whom died when I was 9.
I was born in August of 1980. All of my great-grandparents had passed on before then.
Maternal grandfather died in May of 1992
Paternal grandfather died in March of 1994
Maternal grandmother died in February of 2001
Paternal grandmother died in November of 2010, three months after I’d turned 30
Lessee… My maternal grandfather died in 1971, when I was 14, and my maternal grandmother went in 1985, when I was 28.
My paternal grandmother died in 1969. No idea about my paternal grandfather, as he took off before my father was born. I have seen their marriage license, however, and, despite what my mother says, my father was in fact legitimate…
Now if we’re talking great-grandparents, I had at least one alive when I was born, maybe two. The one for sure was my maternal grandmother’s mother, who died when I was about 10.
I say maybe two because there was this man I vaguely remember, and I think he may have been my maternal grandfather’s father. Maybe. He disappeared not too long after my earliest memories, I forgot about him until after my parents had died – or disappeared, my mother possibly still being out there somewhere, the bitch – but then I started remembering him. I don’t have any records regarding my maternal grandfather’s family.
I’m 39. My Mom’s Dad died a year or two before I was born, and my Mom’s Mom is still alive. My Dad’s Mom died about three years ago (I was the one who made the call) - a year before him, but his Dad and his second wife are still around. My step-Dad’s Dad died before I was born, when he was a teen, and his Mom died maybe eight years ago.
I was 40 when my last two grandparents died, my mom’s parents, and they died within six weeks of one another. I’m extremely grateful to have had them for so long and I miss them every day. My youngest son is 9 and his remaining grandparents are 73 and 86. He won’t have the same experience. 
One thing that drives me to have kids as soon as financially prudent is that I want them to know their grandparents.
My paternal grandfather died when I was 8 (75).
My paternal grandmother died when I was 24 (89).
My maternal grandmother died when I was 39 (95).
My maternal grandfather died when I was 42 (100).
I started out with 4 grandparents and two great-grandmothers.
Both great-grandmothers died by time I was a teenager. I lost my paternal grandmother in my mid-20’s, and both grandfathers within a year of each other in my 30’s. I’ll be 39 next month and have one grandmother left. She’s in reasonably good condition so I expect her to stick around for a while yet knocks wood.
My last grandparent passed a couple years ago when I was 45.
We’re coming up on the two year aniversary of G-Mama’s death. She went in the best way possible though, on her own terms, completely lucid, cracking jokes, and surrounded by loving family… all updating their facebooks with final pictures and vids of her saying goodbye. Weird to experience since I couldn’t make it across the country in person quickly enough, but at least I was virtually there.
Gmama had been mostly bedridden for years due to a variety of physical issues and was actively refusing treatment/surgery for a bowel obstruction. The family was called, she was moved to hospice and palliative care was given. She died the following day shortly after telling my mom and her siblings, “St. Francis says we can visit your father on my way to Heaven.”
Ha. Miss her so much.
Conversely, that was one (of many) reasons I never wanted children. I would never have let my mother near the kids.
I was 45.
The other three died when I was 4; when I was 3; and before I was born.
Three great-grandparents survived into their nineties and into my teens.
I was 39 since my grandma died at 89 – grandma, then mom and pop, and then I were in 25 year increments.
I stumbled upon this post by accident, figured I’d reply even though it’s been a few years.
I’ve been incredibly lucky. I was born with one great great grandmother, 3 great grandmothers, 1 great grandfather and all four of my grandparents. My great grandmother died when I was 2, two of my great grandmothers died when I was 5. I barely remember it. At one of the funerals, I remember I was playing tag with my cousins in the church’s basement - I didn’t get what death was.
I’m 20 and my maternal grandmother’s parents still live together in an apartment. So my mother is 41 and still has her maternal grandparents.
I was 26 at the time my last grandparent died last year.
I’m 46 and still have my last grandparent (she is 97 and will be 98 in June). I come from a very long line of very stubborn people. 
I was 32, last year.
I was 17 when my maternal grandmother died. My paternal grandfather died when I was about to turn 16; my paternal grandmother, when I was 20. My maternal grandfather was a piece of shit who abandoned Grandma before my mother was born, so whenever he died was not soon enough.