All of my great-grandparents were dead before I was born, but I met my great-great grandfather once when I was 3 or 4 (which I don’t remember) and once when I was 9 (which I remember clearly.) He died a year later at age 104. He outlived 2 wives and worked as a farmer and blacksmith and lived alone until about age 101.
I knew my great-great aunt well, who was sort of the equivolent of my great-grandmother because she raised my mom’s mom. She died when I was 13. I think she was about 94.